x86-64: Don't export init_level4_pgt
x86-64: Don't export init_level4_pgt

It's not used by any module, and i386 (as well as some other arches)
also doesn't export its equivalent (swapper_pg_dir).

Signed-off-by: Jan Beulich <01de09643e0ae62e116f8bd77de435799874b456@novell.com>
LKML-Reference: <1349b67cd3f42b74b386924c85dd89e04d026458@vpn.id2.novell.com>
Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas