tgsi/ureg: make the dst register match the src indirection

tgsi/ureg: make the dst register match the src indirection

In ureg src registers could have an indirect register that was
either a temp or an addr register, while dst registers allowed
only addr. That made moving between them a little difficult so
make them behave the same way and allow temp's and addr registers
as indirect files for both (tgsi supports it, just ureg didn't).

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: José Fonseca <jfonseca@vmware.com>