intel_idle: add Granite Rapids Xeon support

intel_idle: add Granite Rapids Xeon support

Add Granite Rapids Xeon C-states, which are C1, C1E, C6, and C6P.

Comparing to previous Xeon Generations (e.g., Emerald Rapids), C6
requests end up only in core C6 state, and no package C-state promotion
takes place even if all cores in the package are in core C6.

C6P requests also end up in core C6, but if all cores have requested
C6P, the SoC will enter the package C6 state.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/20240806160310.3719205-1-artem.bityutskiy@linux.intel.com
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>