MAINTAINERS: Repair file entry in MARVELL 88PM886 PMIC DRIVER

Commit f53d3efa ("MAINTAINERS: Add myself for Marvell 88PM886 PMIC")
adds a file entry referring to drivers/regulators/88pm886-regulator.c,
but the directory is actually called drivers/regulator. Note that there is
no 's' at the end.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair the file entry in the MARVELL 88PM886 PMIC DRIVER section.

Fixes: f53d3efa ("MAINTAINERS: Add myself for Marvell 88PM886 PMIC")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Reviewed-by: Karel Balej <balejk@matfyz.cz>
Link: https://lore.kernel.org/r/20240711065140.140703-1-lukas.bulwahn@redhat.com


Signed-off-by: Lee Jones <lee@kernel.org>