util: Android.mk: Convert implicit rules to static pattern rules

util: Android.mk: Convert implicit rules to static pattern rules

This is a partial cherry-pick from AOSP's mesa3d tree:
 https://android.googlesource.com/platform/external/mesa3d/+/a88dcf769eb00a4ffc7183a0396d881a28b5a29b%5E%21/

"We're deprecating make implicit rules, preferring static pattern
rules, or just regular rules."

Without this patch, the freedesktop/master branch won't build in
the AOSP environment, and this patch corrects that, as tested
on the Dragonboard 820c.

The i965 portion of the patch this is based on collided badly,
and I'm not sure how to best forward port it. However, so far
we don't see build issues without that portion.

Comments or feedback would be appreciated!

Change-Id: Id6dfd0d018cbd665fa19d80c14abd5f75fa10b8a
Cc: Rob Herring <rob.herring@linaro.org>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Marissa Wall <marissaw@google.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>