Revert "net: mvpp2: Improve data types and use min()"

This reverts commit f7023b3d.

Russell indicates that assuming 32bits are sufficient isn't
necessarily safe.

Link: https://lore.kernel.org/20240711154741.174745-1-thorsten.blum@toblux.com/


Signed-off-by: Jakub Kicinski <kuba@kernel.org>