[patch, nios2] use "sstatus" as primary name of r30

[Sandra Loosemore]

Altera has requested that the register r30 disassemble using the 
symbolic name "sstatus" rather than "ba".  Both names are documented in 
the Nios II processor reference handbook.

I've checked in this patch to update the list of register names, a 
warning message that formerly used only the "ba" name, and the 
associated test cases.

-Sandra

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