hal: add voice call support on apq8084

APQ8084 uses external modem to make voice calls.
APQ uses CSD QMI interface to communicate with external
modem. Add csd client apis to support voice calls

Change-Id: I11fe0cc614ee38c42e95b40d5cd5e2d8b3afd43a
diff --git a/hal/Android.mk b/hal/Android.mk
index 8bbfa69..58cf1c6 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -18,6 +18,9 @@
 ifneq ($(filter msm8226,$(TARGET_BOARD_PLATFORM)),)
   LOCAL_CFLAGS := -DPLATFORM_MSM8x26
 endif
+ifneq ($(filter apq8084,$(TARGET_BOARD_PLATFORM)),)
+  LOCAL_CFLAGS := -DPLATFORM_APQ8084
+endif
 endif
 
 LOCAL_SRC_FILES := \