egl/android: enable/disable KHR_partial_update correctly

egl/android: enable/disable KHR_partial_update correctly

Commit f3728816af (egl/android: require ANDROID_native_fence_sync
for buffer age) re-added some stale code removed in commit
b4345da8762 (egl/android: Delete set_damage_region from egl dri
vtbl).  Remove it now.

Commit b4345da8762 assumes KHR_partial_update is only
driver-dependent.  That is mostly true except that the extension
also introduces buffer age query, which depends on
ANDROID_native_fence_sync on Android.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4235>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4235>