Revert "msm: media: uapi: Redefine NV12 format with different alignment"

The revert is made so as to align with dependent changes and merge
all UMD changes at the same time.

This reverts commit b49de316.

Change-Id: Ida7dfa521f18946aa15dc60cc481a0e6188e61db
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>