disp: msm: skip rsc client vote for clk state update only

This change skips RSC client vote for clk_state update when
delta vote and update_tcs_content are false.

Change-Id: I4597167c261f06811ffbd84b2eba4e6aa78d1eea
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>