Remove sparcv8 support

[David Miller]

From: Sam Ravnborg <sam@ravnborg.org>
Date: Wed, 9 Nov 2016 06:49:43 +0100

>> +	.text
>> +	.align		128
>> +	.globl		emulate_cas
>> +	.type		emulate_cas,#function
>> +emulate_cas:
> ENTRY(emulate_cas)
> 
 ...
> ENDPROC()
> 
> Did not (yet) look at the details of emulate_cas.

Thanks Sam, I'll make that change.