hal: Add support for Fluence Far Field Voice

Add support for 6mic Fluence pre-processing of
captured stream using Far Field Voice (FFV) algorithm.

Change-Id: I7a643014f3e090482db7772dce2fc812fd469b2d
diff --git a/hal/Makefile.am b/hal/Makefile.am
index 1d60f2d..0096bf7 100644
--- a/hal/Makefile.am
+++ b/hal/Makefile.am
@@ -189,6 +189,12 @@
 c_sources += audio_extn/hw_loopback.c
 endif
 
+if AUDIO_HW_FFV
+AM_CFLAGS += -DFFV_ENABLED \
+             -I $(PKG_CONFIG_SYSROOT_DIR)/usr/include/ffv/
+c_sources += audio_extn/ffv.c
+endif
+
 h_sources = audio_extn/audio_defs.h \
             audio_extn/audio_extn.h \
             audio_hw.h \