FROMLIST: arm64: mm: Use non-global mappings for kernel space

In preparation for unmapping the kernel whilst running in userspace,
make the kernel mappings non-global so we can avoid expensive TLB
invalidation on kernel exit to userspace.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git


 commit e046eb0c9bf26d94be9e4592c00c7a78b0fa9bfd)

[ghackmann@google.com: apply pgtable-prot.h changes to pgtable.h instead]
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Change-Id: I3f3f0ee0194f315f301f239e05e31ffe0fb733ad
Git-Commit: b92b2976
Git-repo: git://android.googlesource.com/kernel/common.git


[vinmenon@codeaurora.org: trivial merge conflicts]
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>