msm: camera: cpas: Turn off clocks only after IRQs are handled

Wait for IRQ handlers to finish before turning off the CPAS clocks
and power resources.

Change-Id: I3fbb6807ddd74b04ca4f488c54d456e30c6b3a7b
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>
Signed-off-by: Alok Pandey <akumarpa@codeaurora.org>