qcom: Remove build timestamp injection on every build

Change-Id: If2d59c5792f8291f289f88e088621e32229bb682
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

qcom/opensource/display-drivers/msm/Kbuild

@@ -263,5 +263,3 @@ msm_drm-$(CONFIG_DRM_MSM) += msm_atomic.o \
 			     msm_smmu.o \
 			     msm_prop.o
 
-CDEFINES += -DBUILD_TIMESTAMP=\"$(shell date -u +'%Y-%m-%dT%H:%M:%SZ')\"
-