msm: mdss: Generalize per pipe bw limit implementation

Currently per pipe bandwidth limit implementation takes
care of only HFLip and VFLip case. Make it generic such
that it takes care of camera usecase as well.

Change-Id: I6642bdb0611aa973a7563df019bf2dcdd5e4e584
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
Signed-off-by: Raghavendra Ambadas <rambad@codeaurora.org>