msm: camera: icp: Teach A5 to power resume/collapse via its hw_ops

The LX7 processor will require a new mechanism to resume/collapse.
Make the current mechanism transparent to the ICP HW manager in
preparation for the new proc. By going through the hw_ops we let
the device interface decide which mechanism to use.

CRs-Fixed: 2722486
Change-Id: I719314b3f505270a33892cb247082e43dad2e92d
Signed-off-by: Fernando Pacheco <fpacheco@codeaurora.org>