arm64: Add decoding macros for CP15_32 and CP15_64 traps

So far, we don't have anything to help decoding ESR_ELx when dealing
with ESR_ELx_EC_CP15_{32,64}. As we're about to handle some of those,
let's add some useful macros.

Change-Id: I7b1e28df53b3f46983d5451962692093b7dd2d51
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-commit: bd7ac140b82f2bedfc792d8ccf9b2a108c1324f3
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>