Definition of cpu ranges are hard to read if the cpu variant is not
zero. Provide MIDR_CPU_VAR_REV() macro to describe the full hardware
revision of a cpu including variant and (minor) revision.
Signed-off-by: NRobert Richter <rrichter@cavium.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>