hal: Add qcs605 for audioextn feature compilation

- Add qcs605 to select msm8974 platform for
  compilation of audio extn features
  Add qcs605 for enable aac format in audio

Change-Id: I16ec6c9817e219ef182d941a28b7d90fa2c49aca
diff --git a/hal/Android.mk b/hal/Android.mk
index bf19326..de04e52 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -64,6 +64,7 @@
 endif
 ifneq ($(filter qcs605,$(TARGET_BOARD_PLATFORM)),)
   LOCAL_CFLAGS := -DPLATFORM_QCS605
+  LOCAL_CFLAGS += -DMAX_TARGET_SPECIFIC_CHANNEL_CNT="8"
 endif
 ifneq ($(filter msmnile sdmshrike,$(TARGET_BOARD_PLATFORM)),)
   LOCAL_CFLAGS := -DPLATFORM_MSMNILE