(TEMP) hwc: external: Enable default mirroring on hwc1.1

Related to bug: 7124159

UI Mirror works with tearing because sync operates at primary vsync.  Need
kernel patch to wait on external post.

Change-Id: I77116ef40ae25a2207feb5ca3cd9065ef0da6e4a
Signed-off-by: Iliyan Malchev <malchev@google.com>
4 files changed