disp: msm: sde: add qactive override

This change adds the hooks to enable the active signal override
in power collapse sequence. Active signal override is needed to
disable the clock gating when the power collapse sequence
is running.

Change-Id: I9edaed7960b236b3d0179cb67f9cc2c9b3546c9d
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>