drm/msm/sde: call control ops based on control paths

Change the ctrc component to call control path
operations based on number of control paths used rather than
based on layer mixers. This allows calling ops only once for
topologies using 2 layer mixers but single control path.

Change-Id: If5418abeb479f02a4ffe2a0767bf91f1da00209e
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>