msm: mdss: update MDSS driver to support latency ram

Different MDSS hardware variants support fixed pixel
latency ram for each pipe vs SMP (Shared Memory Pool).
Software does not have to handle SMP allocation/deallocation
for hardware with fixed pixel latency ram. This change
enables the driver to handle such MDSS hardware.

Change-Id: Ia55f45d65c3eb19350c7195acd83af8ffc0e9a10
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>