x86/mm: Carve out INVLPG inline asm for use by others

commit f1d84b59 upstream.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/ZyulbYuvrkshfsd2@antipodes


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>