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In that JSON spec file, we now use target-features to specify the use of
the tpidr_el1 instruction for kernel side TLS accesses. This means we
can step aside from the unfortunate LLVM requirement to use the kernel
code model in order for tpidr_el1 instructions to be emitted.

In addition, we suppress generation of NEON instructions for the kernel.

This was set to aarch64-unknown-redox intentionally because that was the
only way to be able to use the kernel code-model.

There's a way to work around that in the following patch and hence move
back to aarch64-unknown-none as the KTARGET.