wifi: Duplicate getValidChannelsForBand in AP iface

This functionality is needed even for AP iface. So, duplicate this
method.

Changes in the CL:
1. Add getValidChannelsForBand() in IWifiApIface.
2. Rename StaBackgroundScanBan to WifiBand to make it a more generic
name.
3. Change the existing method name in IWifiStaIface to match with the
one in IWifiApIface.

While there,
Fix indentation in hidl_callback_util.h

Bug: 35663149
Test: Compiles
Change-Id: Iaeb6c323e13eedf2f98de92fea77e327c76ffa5b
diff --git a/wifi/1.0/Android.mk b/wifi/1.0/Android.mk
index 4476b14..fa6ef6c 100644
--- a/wifi/1.0/Android.mk
+++ b/wifi/1.0/Android.mk
@@ -796,25 +796,6 @@
 LOCAL_GENERATED_SOURCES += $(GEN)
 
 #
-# Build types.hal (StaBackgroundScanBand)
-#
-GEN := $(intermediates)/android/hardware/wifi/V1_0/StaBackgroundScanBand.java
-$(GEN): $(HIDL)
-$(GEN): PRIVATE_HIDL := $(HIDL)
-$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
-$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
-$(GEN): PRIVATE_CUSTOM_TOOL = \
-        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
-        -Ljava \
-        -randroid.hardware:hardware/interfaces \
-        -randroid.hidl:system/libhidl/transport \
-        android.hardware.wifi@1.0::types.StaBackgroundScanBand
-
-$(GEN): $(LOCAL_PATH)/types.hal
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-
-#
 # Build types.hal (StaBackgroundScanBucketEventReportSchemeMask)
 #
 GEN := $(intermediates)/android/hardware/wifi/V1_0/StaBackgroundScanBucketEventReportSchemeMask.java
@@ -1081,6 +1062,25 @@
 LOCAL_GENERATED_SOURCES += $(GEN)
 
 #
+# Build types.hal (WifiBand)
+#
+GEN := $(intermediates)/android/hardware/wifi/V1_0/WifiBand.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava \
+        -randroid.hardware:hardware/interfaces \
+        -randroid.hidl:system/libhidl/transport \
+        android.hardware.wifi@1.0::types.WifiBand
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
 # Build types.hal (WifiChannelInfo)
 #
 GEN := $(intermediates)/android/hardware/wifi/V1_0/WifiChannelInfo.java
@@ -2599,25 +2599,6 @@
 LOCAL_GENERATED_SOURCES += $(GEN)
 
 #
-# Build types.hal (StaBackgroundScanBand)
-#
-GEN := $(intermediates)/android/hardware/wifi/V1_0/StaBackgroundScanBand.java
-$(GEN): $(HIDL)
-$(GEN): PRIVATE_HIDL := $(HIDL)
-$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
-$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
-$(GEN): PRIVATE_CUSTOM_TOOL = \
-        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
-        -Ljava \
-        -randroid.hardware:hardware/interfaces \
-        -randroid.hidl:system/libhidl/transport \
-        android.hardware.wifi@1.0::types.StaBackgroundScanBand
-
-$(GEN): $(LOCAL_PATH)/types.hal
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-
-#
 # Build types.hal (StaBackgroundScanBucketEventReportSchemeMask)
 #
 GEN := $(intermediates)/android/hardware/wifi/V1_0/StaBackgroundScanBucketEventReportSchemeMask.java
@@ -2884,6 +2865,25 @@
 LOCAL_GENERATED_SOURCES += $(GEN)
 
 #
+# Build types.hal (WifiBand)
+#
+GEN := $(intermediates)/android/hardware/wifi/V1_0/WifiBand.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/types.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+        -Ljava \
+        -randroid.hardware:hardware/interfaces \
+        -randroid.hidl:system/libhidl/transport \
+        android.hardware.wifi@1.0::types.WifiBand
+
+$(GEN): $(LOCAL_PATH)/types.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+
+#
 # Build types.hal (WifiChannelInfo)
 #
 GEN := $(intermediates)/android/hardware/wifi/V1_0/WifiChannelInfo.java