mfd: intel_soc_pmic: Move non-Intel Makefile entries to their own group

It looks like a random position for couple of Makefile entries that are
disrupting Intel PMIC group. Move them to their own group.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220801114211.36267-3-andriy.shevchenko@linux.intel.com