platform/x86:intel/pmc: Make tgl_core_generic_init() static

Make tgl_core_generic_init() a static function as the function has no
callers outside of tgl.c. Remove the prototype in core.h and reorder
the code in tgl.c.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250207225615.401235-2-xi.pardee@linux.intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>