sdm: On Doze suspend wait for previous commit release fence.

On Powermode transitions driver stages same set of buffers and updates
release fence. HWC caches those to its internal queue but doesn't get a
chance to propagate back as subsequent commits would fail. In those
cases wait for previous transfer to finish before releasing the buffers.

CRs-Fixed: 2305135
Change-Id: I6187a60a3921bc153ca1be8c364a2fd69d71d70a
2 files changed