We missed all of the scalar fp16 binary operations.

Cc: qemu-stable@nongnu.org
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Tested-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 20180512003217.9105-7-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>