Merge remote-tracking branch 'remotes/palmer/tags/riscv-for-4.0-rc0' into staging

Merge remote-tracking branch 'remotes/palmer/tags/riscv-for-4.0-rc0' into staging

A Single RISC-V Patch for 4.0-rc0

There was a regression introduced by the decodetree conversion that has
a fairly straight-forward fix.  Since this fixes bugs that everyone has
hit I'd like to target it for rc0.

# gpg: Signature made Mon 18 Mar 2019 05:26:07 GMT
# gpg:                using RSA key 00CE76D1834960DFCE886DF8EF4CA1502CCBAB41
# gpg:                issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmer@sifive.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 00CE 76D1 8349 60DF CE88  6DF8 EF4C A150 2CCB AB41

* remotes/palmer/tags/riscv-for-4.0-rc0:
  target/riscv: Fix manually parsed 16 bit insn

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>