msm: mdss: Update memory retention and periph control setting

Previously memory retention and preiph control are only set when
device enters/exits idle power collapse mode. The memory retention
and periph setting will remain ON when device is actually in
suspend state, which will cause unnecessary power consumption.
This change updates those setting for both idle power collapse cases
and suspend/resume case. With this change, the memory retention and
periph will be set to OFF in suspend case to optimize power consumption.

Change-Id: I1598dbc97cb9d02b946de5c9803a49d923c7edc1
Signed-off-by: Ping Li <pingli@codeaurora.org>