update hexagon float ref files

[Richard Henderson]

Happy holidays, Taylor,

I've located a bug in tests/multiarch/float_*, which means that the hexagon *.ref files 
are out of date.

At your convenience, would you please check out

https://gitlab.com/rth7680/qemu/-/commits/fix-sfp-test

and re-generate the files for me?  I'll squash the diff into my patch for 
bisection.


r~