arm/xen: remove duplicate arch_gnttab_init() function
arm/xen: remove duplicate arch_gnttab_init() function

This was introduced in commit e306e3be1cbe (Merge tag
'stable/for-linus-3.17-rc0-tag').

Signed-off-by: David Vrabel <b9d45bd1f671e508cd8daa63dfc3cabb597562df@citrix.com>
Acked-by: Stefano Stabellini <22a0c6385d750d07aa383c9f813cf6f0228657d8@eu.citrix.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs