MAINTAINERS: make the DPLL entry cover drivers

MAINTAINERS: make the DPLL entry cover drivers

DPLL maintainers should probably be CCed on driver patches, too.
Remove the *, which makes the pattern only match files directly
under drivers/dpll but not its sub-directories.

Acked-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Acked-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Link: https://patch.msgid.link/20250915234255.1306612-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>