arm64: cputype: Add Cortex-X3 definitions

Add cputype definitions for Cortex-X3. These will be used for errata
detection in subsequent patches.

These values can be found in Table A-263 ("MIDR_EL1 bit descriptions")
in issue 07 of the Cortex-X3 TRM, which can be found at:

  https://developer.arm.com/documentation/101593/0102/?lang=en



Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240603111812.1514101-2-mark.rutland@arm.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>