perf/x86/intel/uncore: Add Sapphire Rapids server PCU support

The PCU is the primary power controller for the Sapphire Rapids.

Except the name, all the information can be retrieved from the discovery
tables.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/r/1625087320-194204-7-git-send-email-kan.liang@linux.intel.com