Revert "Dynarec: Fixed DMULT/DMUTU/DDIV/DDIVU register allocation"

This reverts commit 875de15a173182e2fcd43ff85dc7d5c86fe16903.
Dynarec: Fixed DMULT/DDIV/DDIVU register allocation
Dynarec: Fixed DADD/DADDU
Merge remote-tracking branch 'origin/master' into dk64_hack