Update gcc-arm toolchains to 9.2-2019.12

Besides the update, rename toolchain including the infix '-none-'. Also, avoid
hardcoded filenames and/or directories referring toolchains.

Change-Id: I576aa5bc9ca0b29b5b8ec6264af540b0053bc4e5
Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
3 files changed