HDMI should be updated only in conjunction with primary.
Which means on a resume from suspend (which is treated as
cable connect in HALs) we need not draw ahead of primary.
A good way (already existing) is to call invalidate() on SF
on cable connect so that primary is updated and only then HDMI,
by a trigger from disp_loop thread.
Change-Id: I7d5268b2f0e27adb04aade757c36483cdfc1333e
CRs-fixed: 335763
Conflicts:
libgralloc/framebuffer.cpp
libhwcomposer/hwcomposer.cpp
7015a91bc8