msm: mdss: update bandwidth  requests on clock switches

Bandwidth requests to the bus need to be cleared when clock
is turned off for command panel to save power.

Change-Id: Id952bf191100ec817c7201e8948ce1eefd6cdc8d
Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>

Conflicts:

	drivers/video/msm/mdss/mdss.h

Signed-off-by: Ajay Dudani <adudani@codeaurora.org>