vc4: Fix up tile alignment checks for blitting using just an RCL.

vc4: Fix up tile alignment checks for blitting using just an RCL.

We were checking that the blit started at 0 and was 1:1, but not that it
went to the full width of the surface, or that the width was aligned to a
tile.  We then told it to blit to the full width/height of the surface,
causing contents to be stomped in a bunch of MSAA tests that happen to
include half-screen-width blits to 0,0.