Update our kernel string routines to the latest Cortex Strings
implementation.
* for-next/cortex-strings:
arm64: update string routine copyrights and URLs
arm64: Rewrite __arch_clear_user()
arm64: Better optimised memchr()
arm64: Import latest memcpy()/memmove() implementation
arm64: Add assembly annotations for weak-PI-alias madness
arm64: Import latest version of Cortex Strings' strncmp
arm64: Import updated version of Cortex Strings' strlen
arm64: Import latest version of Cortex Strings' strcmp
arm64: Import latest version of Cortex Strings' memcmp