MAINTAINERS: Adjust file entry in NXP PF1550 PMIC MFD DRIVER

MAINTAINERS: Adjust file entry in NXP PF1550 PMIC MFD DRIVER

Commit ebaec90ec0b5 ("mfd: pf1550: Add core driver for the PF1550 PMIC")
adds the header file pf1550.h in include/linux/mfd/, and commit
a7d6255a0bf3 ("MAINTAINERS: Add an entry for PF1550 MFD driver") adds a new
section NXP PF1550 PMIC MFD DRIVER intending to refer to that header file.
It however adds the entry for pfd1550.h; note the additional letter in the
filename.

Adjust the file entry to refer to the intended file.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Reviewed-by: Samuel Kayode <samkay014@gmail.com>
Link: https://patch.msgid.link/20251029104228.95498-1-lukas.bulwahn@redhat.com
Signed-off-by: Lee Jones <lee@kernel.org>