Aarch64: fix encoding map for kA64Fmov2xS.
Aarch64: fix encoding map for kA64Fmov2xS.

Change-Id: I5127a4443969dc2322461a4b4a34d6c39a0ffd64

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst