UPSTREAM: arm64: insn: fix compare-and-branch encodings

Fix cbz/cbnz having the mask offset by a bit, and add encodings for
tbz/tbnz so that all branch forms are represented.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 31432001
Change-Id: Id375e3946f6899a849e6e834a5448d6b61c23a7e
(cherry picked from commit 115386f89b5415fcdf641faad0d459cd5c07d225)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>