arc-mesa-virgl: Hardcode Android SDK API to 28

arc-mesa-virgl currently does not yet support an API level higher than
28, so we need to set a hard limit so we don't break when we try to
build more recent versions of the Android profiles.

BUG=b:160748345
BUG=b:156569377
TEST=`./build_packages --board=rammus-arc-r arc-mesa-virgl`

Cq-Depend: chrome-internal:3144360
Cq-Depend: chromium:2286975
Change-Id: I0f682238668d744148933667720db44d9099ac0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2286749
Tested-by: Morg <morg@chromium.org>
Auto-Submit: Morg <morg@chromium.org>
Reviewed-by: Lepton Wu <lepton@chromium.org>
Commit-Queue: Morg <morg@chromium.org>
3 files changed