x86/platform/uv: Log gap hole end size

Show value of gap end in the kernel log which equates to number of physical
address bits used by system.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220406195149.228164-4-steve.wahl@hpe.com