perf/x86/intel/uncore: Support MSR portal for discovery tables

perf/x86/intel/uncore: Support MSR portal for discovery tables

Starting from the Panther Lake, the discovery table mechanism is also
supported in client platforms. The difference is that the portal of the
global discovery table is retrieved from an MSR.

The layout of discovery tables are the same as the server platforms.
Factor out __parse_discovery_table() to parse discover tables.

The uncore PMON is Die scope. Need to parse the discovery tables for
each die.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20250707201750.616527-2-kan.liang@linux.intel.com