arm64: cputype: Add Cortex-A720 definitions

arm64: cputype: Add Cortex-A720 definitions

Add cputype definitions for Cortex-A720. These will be used for errata
detection in subsequent patches.

These values can be found in Table A-186 ("MIDR_EL1 bit descriptions")
in issue 0002-05 of the Cortex-A720 TRM, which can be found at:

  https://developer.arm.com/documentation/102530/0002/?lang=en

Signed-off-by: Mark Rutland <[email protected]>
Cc: James Morse <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>