Multilib builds only require one crosssdk toolchain. We therefore shouldn't
be remapping crosssdk names. This resolves build failures looking for
weird multilib crosssdk toolchains.
(From OE-Core rev: aa8b93e2db06866529d20939452f81fb9e18aaab)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>