Add tunes for all the ARMv8a cores currently supported in GCC. This
is: Cortex-A34, Cortex-A73, and Cortex-A73-Cortex-A35.
(From OE-Core rev: fdf6921f145658b1f1c2e7413a2cde6857ddb768)
Signed-off-by: Jon Mason <jon.mason@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>