mdss: mdp: modify MISR offset for 8952

Additional offset is needed for MISR CTRL and SIGNATURE
registers on 8952. Add the required offset of 0x10.
Also add logic to select appropriate registers for video
and command mode.

Change-Id: I148200bdac98dfb446d7958ab700ed221e3d48d0
Signed-off-by: Anusha Koduru <kanusha@codeaurora.org>