regulator: hi6421: Use correct variable type for regmap api val argument

Use unsigned int instead of u32 for regmap_read/regmap_update_bits val
argument.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210619124133.4096683-1-axel.lin@ingics.com


Signed-off-by: Mark Brown <broonie@kernel.org>