arch-arm: rename operands to match spec in isa/formats/fp.isa

Matches ARM DDI 0487D.a decoding tables.

Change-Id: I48338ef956a04308d55d1022229ebe0962a8fe5d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18688
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed