arm64: mops: Handle MOPS exceptions from EL1

We will soon be using MOPS instructions in the kernel, so wire up the
exception handler to handle exceptions from EL1 caused by the copy/set
operation being stopped and resumed on a different type of CPU.

Add a helper for advancing the single step state machine, similarly to
what the EL0 exception handler does.

Signed-off-by: Kristina Martsenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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