msm: mdss: include rotator enum during mixer pipe update

When updating the pipes for all the stages during the pipe
update, we need to consider the first enum so the rotator
is considered; otherwise bandwidth calculations does not
add the contribution of the rotator for the final
bandwidth calculation.

Change-Id: I970e6dcbf3dc37819135bc4d632858f3ebc486bf
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>