arch-gcn3: Implement instruction v_div_fixup_f32

arch-gcn3: Implement instruction v_div_fixup_f32

Instruction v_div_fixup_f32 was unimplemented. The
implementation was added by mimicking v_div_fixup_f64.

Change-Id: I9306b198f327e9fde3414aa1bb2bec20503b1efd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29924
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Xianwei Zhang <xianwei.zhang@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>