target-arm: Implement ARMv8 MVFR registers

For ARMv8 there are two changes to the MVFR media feature registers:
 * there is a new MVFR2 which is accessible from 32 bit code
 * 64 bit code accesses these via the usual sysreg instructions
   rather than with a floating-point specific instruction

Implement this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

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