arm64: Add helpers for checking CPU MIDR against a range

Add helpers for checking if the given CPU midr falls in a range
of variants/revisions for a given model.

Change-Id: Ifde0f33ededa0be56d63ed4efad21fbf5a99e6fc
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 1df310505d6d544802016f6bae49aab836ae8510
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[isaacm@codeaurora.org: remove code that is not needed for
 having a way of expressing a list of CPUs that would
 be impacted by erratum 1024718.]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>