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

The MDF subsystem is a new IP built to support the new Intel Xeon
architecture that bridges multiple dies with a embedded bridge system.

The layout of the control registers for a MDF uncore unit is similar to
a IRP uncore unit.

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/1625087320-194204-12-git-send-email-kan.liang@linux.intel.com