samsung: move modemloader and wifiloader to /vendor

Init scripts and SEPolicy need updating after this change.

Example on universal7580:
https://review.lineageos.org/c/LineageOS/android_device_samsung_universal7580-common/+/264957

Change-Id: Ia1d8801a2b06eca89d05257e9c011799082c66a9
diff --git a/modemloader/Android.mk b/modemloader/Android.mk
index 1e18b32..34bb1aa 100644
--- a/modemloader/Android.mk
+++ b/modemloader/Android.mk
@@ -21,6 +21,7 @@
 LOCAL_SHARED_LIBRARIES := liblog libcutils
 
 LOCAL_MODULE := modemloader
+LOCAL_VENDOR_MODULE := true
 LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_EXECUTABLE)