[AArch64][SVE] Fix lowering of "fcmp ueq/one" when using SVE

We were previously lowering to the incorrect instructions for the
setcc DAG node when using the SETUEQ and SETONE floating point
condition codes. I have fixed this by marking the SETONE code
as Expand and letting the SETUNE code be legal. I have also
fixed up the patterns for FCMNE_PPzZZ and FCMNE_PPzZ0 to use
the correct opcode.

Differential Revision: https://reviews.llvm.org/D121905