regulator: pf8x00: Fix typo for PF8200 chip name

Trivial typo fix.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Adrien Grassein <adrien.grassein@gmail.com>
Link: https://lore.kernel.org/r/20210128120151.554411-1-axel.lin@ingics.com


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