binutils: Bail out if gold is used on 32/64 bit RISC-V

binutils: Bail out if gold is used on 32/64 bit RISC-V

gold is not supporting risc-v yet and, this will cause subltle errors
during build e.g. autoconf not finding certain features like visibility
and it could take a while to unwind the problem. Its better to error out
early

Remove dwp and ld.gold for rv32 as well

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>