modules: tf-m: Add Crosstool-NG toolchain support
Zephyr SDK is not supported on OS X, however, Zephyr toolchain can be
built on OS X using Crosstool-NG.
Currently, trusted-firmware-m CMakeLists.txt only supports `zephyr` and
`gnuarmemb` toolchains which prohibits building TF-M on OS X using
Zephyr toolchain built with Crosstool-NG.
docs:
https://docs.zephyrproject.org/latest/getting_started/toolchain_3rd_party_x_compilers.html#crosstool-ng
Signed-off-by: Devaraj Ranganna <devaraj.ranganna@linaro.org>
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