panfrost: Fix viewport scissor for preload draws
The max values are inclusive, so add 1 before aligning. This means that a max of 32 will be aligned up to 64 then be decremented to 63. Add a comment to the pan_fb_info struct to document maxx and maxy as inclusive. Fixes: 8ba2f9f6 ("panfrost: Create a blitter library to replace the existing preload helpers") Reviewed-by:Boris Brezillon <boris.brezillon@collabora.com> Part-of: <mesa/mesa!10542>