msm: mdss: add bandwidth check per pipe

Add check to verify that the bandwidth of a pipe does not exceed
the threshold per pipe. The check happens during the overlay setup
and if the pipe exceed the limit, the driver will try to decimate to
reduce the bandwidth; but even if after decimation the limit is
exceeded, it will fail the configuration.

Change-Id: I7ad3654126a503e41540fca250276d564aecccdd
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>