powerpc/mm: Switch to generic RCU get_user_pages_fast

This patch switch the ppc arch to use the generic RCU based
gup implementation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --cc arch/powerpc/Kconfig
Simple merge

diff --cc arch/powerpc/include/asm/hugetlb.h
Simple merge

diff --cc arch/powerpc/include/asm/page.h
Simple merge

diff --cc arch/powerpc/include/asm/pgtable-ppc64.h
Simple merge

diff --cc arch/powerpc/include/asm/pgtable.h
Simple merge

diff --cc arch/powerpc/mm/Makefile
Simple merge

diff --cc arch/powerpc/mm/gup.c
Simple merge

diff --cc arch/powerpc/mm/hugetlbpage.c
Simple merge