target/arm: Implement FCSEL for fp16

target/arm: Implement FCSEL for fp16

These were missed out from the rest of the half-precision work.

Cc: qemu-stable@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180512003217.9105-10-richard.henderson@linaro.org
[rth: Fix erroneous check vs type]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit ace97feef3613194900d4eb9ffc6819b840fbaeb)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>