lima: drop scissor-based partial clear in lima_clear()
According to src/gallium/docs/source/context.rst, the clear() function should not do partial clear of a surface -- it only does clear on one or more full surface. In addition, the partial clear code in lima_clear seems to be the reason of some weird GPIR error.
Only do full framebuffer clear in lima_clear() now, to correct the behavior and prevent the GPIR error.
Signed-off-by: Icenowy Zheng icenowy@aosc.io