The Kconfig option TOOLCHAIN_VARIANT (not to be confused with
ZEPHYR_TOOLCHAIN_VARIANT) is a legacy configuration option that has
very few use-cases and can easily be dropped.
It's functionality is easily covered by CONFIG_X86_IAMCU and
ZEPHYR_TOOLCHAIN_VARIANT.
This commit removes all references of it from Zephyr.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
Move toolchain definitions into toolchain/ and move compilers to
compilers/
Usage of toolchain- for everything was confusing, there are the actual
compiler related definitions and there is the toolchain/SDK related
configs, so keeping them separate helps understand the different and
prevents confusion.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>