x86/platform/uv: Add deprecated messages to /proc info leaves

Add "deprecated" message to any access to old /proc/sgi_uv/* leaves.

 [ bp: Do not have a trailing function opening brace and the arguments
   continuing on the next line and align them on the opening brace. ]

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lkml.kernel.org/r/20201128034227.120869-5-mike.travis@hpe.com