drm/imagination: loop counters moved to loop scope

Reduce the scope of some loop counters as these aren't needed outside
the loops they're used in.

Signed-off-by: Alexandru Dadu <alexandru.dadu@imgtec.com>
Reviewed-by: Matt Coster <matt.coster@imgtec.com>
Link: https://lore.kernel.org/r/20250402-for-loop-counter-scope-v2-1-4fd550d22832@imgtec.com


Signed-off-by: Matt Coster <matt.coster@imgtec.com>