msm: camera: icp: Add Power Collapse

It adds power collapse and removes fw download being done two times.
FW Download is done once only during bootup in camera server context.
After FW download, a5 is put to power collapse and wfi. During the time
of first acquire a5 core is brought back out in action.
Interframe Power collapse is enabled here. During each acquire of
ipe0/ipe1/bps FW is given control of GDSC.
A5 power collapse is always enabled. Interframe Power Collapse is
enabled by default. Interframe power collapse can be disabled using below
command. It must be disabled before usecase start.

adb shell "echo 0 > /sys/kernel/debug/camera_icp/icp_pc"

Change-Id: Idf14f164b5443fcd2872acd3526fc10acc82d11c
Signed-off-by: Alok Pandey <akumarpa@codeaurora.org>