clk: qcom: mdss: Reduce delays in HDMI clock enable

Reducing delays in HDMI clock enable to prevent
the thread from being held in the realtime process
and hogging the CPU. Updated delays are provided
after further hardware testing. With the added
microsecond delay in the timout loop, C and PHY
ready should occur well before timeout.

Change-Id: Ib36a06e5309f3f8ba9e4013d08ca2ed108457beb
Signed-off-by: Casey Piper <cpiper@codeaurora.org>