feat(cts): Add MXFP FP SPECIAL generator support
- Add AboveMaxFP* entries for MXFP types (excluding MXINT8 and FP8UE8M0)
- Add unit tests for CAST FP_SPECIAL generation
Signed-off-by: Ian Tayler Lessa ian.taylerlessa@arm.com
Signed-off-by: Ian Tayler Lessa ian.taylerlessa@arm.com