dsp: add audio event notifier support

Add support for audio event notifier framework to
send/receive events across audio drivers.

CRs-Fixed: 2244131
Change-Id: I1e36703a91625cd52333596d66dc21a0e8876738
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>

dsp/Kbuild

@@ -75,6 +75,7 @@ COMMON_INC :=	-I$(AUDIO_ROOT)/$(COMMON_DIR)
 ############ QDSP6V2 ############
 
 ifdef CONFIG_SND_SOC_MSM_QDSP6V2_INTF
+	Q6_OBJS += msm-audio-event-notify.o
 	Q6_OBJS += audio_calibration.o
 	Q6_OBJS += audio_cal_utils.o
 	Q6_OBJS += q6adm.o