kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET

kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET

There's a 0x1000 in various places, which looks better with a name.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit aeda21d77e22fb382c51fd3f6bbb18df69bc032f)
Orabug: 27333760
CVE: CVE-2017-5754
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Conflicts:
	arch/x86/entry/entry_64.S (not in this tree)
	arch/x86/kernel/entry_64.S (patched instead of that)

Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>