Add various vendor specific cross build targets.
This can be verified by using linaro toolchain and running
meson build --cross-file config/arm/arm64_<cpu>_<platform>_<compiler>
In future more cross build targets can be added.
Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
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