qcacld-3.0: Remove date and time from build tag

To improve build time performance remove date and time
embedding from wifi DLKM Kbuild config.

Change-Id: I465699005b0e5eee762f528a8d8f102c1987b18e
CRs-Fixed: 2855334

Kbuild

@@ -3862,13 +3862,7 @@ CMN_IDS = $(shell cd "$(WLAN_COMMON_INC)" && \
 	git log -50 $(CMN_CHECKOUT)~..HEAD | \
 		sed -nE 's/^\s*Change-Id: (I[0-f]{10})[0-f]{30}\s*$$/\1/p' | \
 		paste -sd "," -)
-# date -u +'%F %T.%6N %Z'
-#	%F  : Full date
-#	%T  : Time
-#	%6N : Nanoseconds to 6 digits
-#	%Z  : Time zone
-TIMESTAMP = $(shell date -u +'%F %T.%6N %Z')
-BUILD_TAG = "$(TIMESTAMP); cld:$(CLD_IDS); cmn:$(CMN_IDS);"
+BUILD_TAG = "cld:$(CLD_IDS); cmn:$(CMN_IDS);"
 # It's assumed that BUILD_TAG is used only in wlan_hdd_main.c
 CFLAGS_wlan_hdd_main.o += -DBUILD_TAG=\"$(BUILD_TAG)\"
 endif