platform/x86:intel/pmc: Enable debugfs multiple PMC support

Enable debugfs support for multiple PMC. These debugfs attributes
show information for all enabled PMCs.

pch_ip_power_gating_status
substate_status_registers
substate_live_status_registers
ltr_show
ltr_ignore
Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230613225347.2720665-5-rajvi.jingar@linux.intel.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>