Revert "soc: qcom: rpmh: Update dirty flag only when data changes"

This reverts commit 9edb7370.

This is a preparation change for merging android-5.4.54 into
msm-5.4 branch. Revert this change to continue using existing
driver that is already supporting same functionality being
added in this change.

Change-Id: I017becf75b2e5383902dd91e33e94702127be94f
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>