powerpc: drop unused GENERIC_CSUM Kconfig item

[Michael Ellerman]

On Fri, 2019-02-15 at 10:32:02 UTC, Christophe Leroy wrote:
> Commit d4fde568a34a ("powerpc/64: Use optimized checksum routines on
> little-endian") converted last powerpc user of GENERIC_CSUM.
> 
> This patch does a final cleanup dropping the Kconfig GENERIC_CSUM
> option which is always 'n', and associated piece of code in
> asm/checksum.h
> 
> Fixes: d4fde568a34a ("powerpc/64: Use optimized checksum routines on little-endian")
> Reported-by: Christoph Hellwig <hch at lst.de>
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Reviewed-by: Christoph Hellwig <hch at lst.de>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/d065ee93aab6ef4c2a5af5c455b5044b

cheers