FROMLIST: arm64: mm: Rename post_ttbr0_update_workaround

FROMLIST: arm64: mm: Rename post_ttbr0_update_workaround

The post_ttbr0_update_workaround hook applies to any change to TTBRx_EL1.
Since we're using TTBR1 for the ASID, rename the hook to make it clearer
as to what it's doing.

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 158d495899ce55db453f682a8ac8390d5a426578)

Change-Id: Iaf152ca1bd0a20bd15a77afac4ad4e9ea8ada08f
Signed-off-by: Greg Hackmann <ghackmann@google.com>