drm/msm/a2xx: support loading legacy (iMX) firmware

Support loading A200 firmware generated from the iMX firmware header
files. The firmware lacks protection support, however it allows GPU to
function properly while using the firmware files with clear license
which allows redistribution.

Cc: Jonathan Marek <jonathan@marek.ca>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/516443/
Link: https://lore.kernel.org/r/20230101155753.779176-1-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>

drm/msm/adreno: add a2xx

derived from the a3xx driver and tested on the following hardware:
imx51-zii-rdu1 (a200 with 128kb gmem)
imx53-qsrb (a200)
msm8060-tenderloin (a220)

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>