msm/sde/rotator: setup irq during first rotator commit

Move the rotator irq registration from probe to first commit, as the
irq is available only after bind on the mdss master device.
The late bind is causing rotator driver to get defered multiple times
and on some occasions rotator probe is not called as its stuck in
the deferred probe list.

Change-Id: I4ccb1e215bda5702ca3a8b37d52737d4e4f60972
Signed-off-by: Kalyan Thota <kalyant@codeaurora.org>
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>