perf/x86/intel/uncore: Make uncore_discovery clean for 64 bit addresses

Support 64-bit BAR size for discovery, and do not truncate return from
generic_uncore_mmio_box_ctl() to 32 bits.

Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20220218175418.421268-1-steve.wahl@hpe.com