hal: Add support for audio feature manager

Fetch feature flags from audio config store.
Provide an interface for audio_extn, platform
and hal code to check if a feature is enabled
or disabled at runtime.

Change-Id: I35d873c787258aee75481de343fcbcbc51cb9e91
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 86bbf98..f75ffe1 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -79,6 +79,7 @@
 
 LOCAL_C_INCLUDES := \
         external/tinyalsa/include \
+        vendor/qcom/opensource/audio-hal/primary-hal/hal \
         $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include \
 	$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include \
         $(call include-path-for, audio-effects) \