platform/x86/intel/pmc: Move LPM mode attributes to PMC

platform/x86/intel/pmc: Move LPM mode attributes to PMC

Move LPM modes attributes from the pmc_dev to the pmc structure. LPM
modes are PMC-specific and should be stored within the pmc structure.

After the change, LPM mode information will be retrieved and stored per
PMC. The substate_requirements attribute in debugfs will display the
requirements for each enabled LPM substate.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
Link: https://patch.msgid.link/20260108223144.504267-3-xi.pardee@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>