RFR 8208183: update HSDIS plugin license to UPL

[Magnus Ihse Bursie]

> Yes, please. And it would be absolutely fantastic to actually build it and ship it in default
> OpenJDK images :)

Am I correct in understanding that there are no more legal barriers 
towards doing such a thing anymore?

I can easily add a new make target to build hsdis.

Adding a new binary to the OpenJDK images will require a CSR. This in 
turn will likely require that there are proper tests that can be run (I 
have no idea of the current status of hsdis testing). I can't help you 
with either of these two.

/Magnus