drm/panfrost: Add sanity checks to submit IOCTL
So userspace can get feedback on any error conditions, instead of going ahead and things breaking later. Signed-off-by: NTomeu Vizoso <tomeu.vizoso@collabora.com> Signed-off-by: NRob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190424131355.62817-1-tomeu.vizoso@collabora.com
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