platform/x86/intel/pmc: Add missing extern

Add missing extern for tgl_h_reg_map. Fixes sparse warning:

  drivers/platform/x86/intel/pmc/tgl.c:213:26: warning: symbol 'tgl_h_reg_map' was not declared. Should it be static?

Fixes: 544f7b7f ("platform/x86/intel/pmc: Add regmap for Tiger Lake H PCH")
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20231223032548.1680738-9-david.e.box@linux.intel.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/intel/pmc/core.h

@@ -452,6 +452,7 @@ extern const struct pmc_bit_map tgl_vnn_misc_status_map[];
 extern const struct pmc_bit_map tgl_signal_status_map[];
 extern const struct pmc_bit_map *tgl_lpm_maps[];
 extern const struct pmc_reg_map tgl_reg_map;
+extern const struct pmc_reg_map tgl_h_reg_map;
 extern const struct pmc_bit_map adl_pfear_map[];
 extern const struct pmc_bit_map *ext_adl_pfear_map[];
 extern const struct pmc_bit_map adl_ltr_show_map[];