libunwind is not yet ported to RISCV32
(From OE-Core rev: 2cce2a296b4659a6c7e7f069e11f6f35957608d2)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>