reset: starfive: Use 32bit I/O on 32bit registers

reset: starfive: Use 32bit I/O on 32bit registers

The driver currently uses 64bit I/O on the 32bit registers. This works
because there are 4 assert registers and 4 status register, so they're
only ever accessed on 64bit boundaries.

There are however other reset controllers for audio and video on the SoC
with only one status register that isn't 64bit aligned so 64bit I/O
would result in an unaligned access exception.

Switch to 32bit I/O in preparation for supporting these resets too.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>