liboverlay: Set mdp src format as rotator output format.

* Set mdp source format as rotator output format
rather than determine it from a fixed mapping of
input/output formats.

* This is needed since for the same input format
to rotator, fastyuv mode if enabled may result in
a different output format than the one if the mode
is not enabled.

* Do the inline optimization for rotator where possible

CRs-fixed: 451064
Change-Id: If0bb2f3a44df10968383ab3f5c3625257518934d
7 files changed