KVM: arm64: re-factor hyp.S debug register code

This is a pre-cursor to sharing the code with the guest debug support.
This replaces the big macro that fishes data out of a fixed location
with a more general helper macro to restore a set of debug registers. It
uses macro substitution so it can be re-used for debug control and value
registers. It does however rely on the debug registers being 64 bit
aligned (as they happen to be in the hyp ABI).

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
(cherry picked from commit e0a1b9a937dc6df9eb402af8966b5d617c7c6b34)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

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