hwc: reserve one gscaler each for FIMD and HDMI

Prevents FIMD and HDMI from stomping on each other's Gscaler devices
that have been left open

Bug: 7202379
Change-Id: I3f068810a747e45b7c0200bba34c232d9aa54431
Signed-off-by: Greg Hackmann <ghackmann@google.com>
1 file changed