platform/x86: intel/pmc: Move variable declarations and definitions to header and core.c

Move the msr_map variable declaration to core.h and move the pmc_lpm_modes
definition to core.c.

This is a prepartory patch for redesigning the pmc core driver as the
variables will be used in multiple PCH specific files.

Cc: David E Box <david.e.box@linux.intel.com>
Reviewed-by: "David E. Box" <david.e.box@linux.intel.com>
Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: "David E. Box" <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20221114183257.2067662-3-gayatri.kammela@linux.intel.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>