audio: update kernel version reference

Update kernel version references from 4.19 to 5.4.
Update symbolic links to new kernel version files.

Change-Id: I38baa52218b16e0b0c86ad898912d29ec4d3d516
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>

asoc/codecs/wcd937x/Kbuild

@@ -11,7 +11,7 @@ endif
 ifeq ($(KERNEL_BUILD), 1)
 	# These are configurable via Kconfig for kernel-based builds
 	# Need to explicitly configure for Android-based builds
-	AUDIO_BLD_DIR := $(ANDROID_BUILD_TOP)/kernel/msm-4.19
+	AUDIO_BLD_DIR := $(ANDROID_BUILD_TOP)/kernel/msm-5.4
 	AUDIO_ROOT := $(AUDIO_BLD_DIR)/techpack/audio
 endif
 
@@ -50,7 +50,7 @@ endif
 # config.
 
 ############ UAPI ############
-UAPI_DIR :=	uapi
+UAPI_DIR :=	uapi/audio
 UAPI_INC :=	-I$(AUDIO_ROOT)/include/$(UAPI_DIR)
 
 ############ COMMON ############