gralloc: only advertise fp16 and rgba1010102 support for Android 10+

The 2 formats were falsely required in Android 10. This patch is to fix
crrev/c/3158977.

BUG=b:200123244
TEST=Pie android.graphics.cts.BitmapColorSpaceTest#test16bitHardware

Change-Id: I31aef2b153b6b9a634cbca333dd73b189db0929d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3166774
Commit-Queue: Yiwei Zhang <zzyiwei@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Tested-by: Yiwei Zhang <zzyiwei@chromium.org>
Auto-Submit: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>