tflite: Add accel-config-optimization patch

We would need accel-config-optimization patch to avoid excessive time
needed to pass tast.tflite.DTS.* with accel config.

BUG=b:338910179, b:332423167
TEST=tast run <dut> tflite.DTS.*

Change-Id: Ieb86a028fc9802b21a9c4a0999b593b58c1b1601
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tflite/+/5964976
Reviewed-by: Tommy Chiang <ototot@google.com>
Commit-Queue: Ching-Kang Yen <chingkang@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Tested-by: Ching-Kang Yen <chingkang@chromium.org>