Add the new TUNE_FEATURES to the 'features:' list, based on matching output
with:
rustc --target=riscv32i-unknown-none-elf -Ctarget-feature=help
Use the TUNE_RISCV_ABI instead of guessing for the ABI.
Pass the arch "as-is", since it should now be riscv32 or riscv64.
(From OE-Core rev: 88b59db87d2c65e5be0f3fee1ebf4ee64ef05f18)
Signed-off-by: Mark Hatle <mark.hatle@amd.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>