media/gpu/v4l2vda: use new IP Process() method with import mode

Now that all the subclasses of ImageProcessor support the new Process()
method, use this method when in import mode.

Bug: 792790
Bug: 921931
Test: VDA unittest passed in regular and import mode on Hana.
Test: VEA unittest passed on Peach_pit.

Change-Id: I09d205a890a77cf4d2e02a0a737de3f7448f815a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1517507
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643242}
1 file changed