chromeos-chrome: Add USE flag for protected_av1

Previously we were just enabling protected AV1 content on Intel chipsets
that had protected content support. Now AMD has it as well, but not on
all chipsets. Due to that we have a separate flag we can use to
selectively enable AV1 protected content if a vendor doesn't support it
across all their chipsets.

BUG=b:232908730
TEST=emerge-skyrim chromeos-chrome sets the flag,
     emerge-guybrush chromeos-chrome does not set the flag

Cq-Depend: chromium:3733007
Change-Id: Ide5f1f3d7f804519fee33958fe1513b9888c09e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3733170
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Tested-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
1 file changed