perf/x86/intel/uncore: Move uncore discovery init struct to header

perf/x86/intel/uncore: Move uncore discovery init struct to header

The discovery base MSR or PCI device is platform-specific and must be
defined statically in the per-platform init table and passed to the
discovery code.

Move the definition of struct intel_uncore_init_fun to uncore.h so it
can be accessed by discovery code, and rename it to reflect that it
now carries more than just init callbacks.

Shorten intel_uncore_has_discovery_tables[_pci/msr] to
uncore_discovery[_pci/msr] for improved readability and alignment.

Drop the `intel_` prefix from new names since the code is under the
intel directory and long identifiers make alignment harder.  Further
cleanups will continue removing `intel_` prefixes.

No functional change intended.

Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://patch.msgid.link/20251231224233.113839-2-zide.chen@intel.com