Expose API for SurfaceFlinger to set force composition. The SurfaceFlinger
can set the force composition flag for avoiding skip composition.
CRs-fixed: 374830
(cherry picked from commit a3c5794b27d2bf7fbc539e3f13a8daaf74724d94)
Conflicts:
libhwcomposer/a-family/hwcomposer.cpp
libhwcomposer/hwcomposer.cpp
libqcomui/qcom_ui.h
Change-Id: I277484ea5ab4ef8d2bccdd480785356d02f6efa8