CHROMIUM: [media] rk3288-vpu: Implement VIDIOC_ENUM_FRAMESIZES

CHROMIUM: [media] rk3288-vpu: Implement VIDIOC_ENUM_FRAMESIZES

This patch adds implementations of VIDIOC_ENUM_FRAMESIZES for rk3288-vpu
encoder and decoder devices. This IOCTL lets the userspace learn about
frame size limits of the hardware.

BUG=chromium:485409
TEST=vda/veatests, Chrome with crrev.com/1097913002.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/269867
Reviewed-by: Heng-ruey Hsu <henryhsu@google.com>
Change-Id: Ia23a89c2f380b16cc7ef8338d33946d62f8a68fe
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>