powerpc: Fix trivial typo in comment

[Michael Ellerman]

On Fri, 2015-27-02 at 22:22:54 UTC, Yannick Guerrini wrote:
> Change 'Kenrel' to 'Kernel'
> 
> Signed-off-by: Yannick Guerrini <yguerrini at tomshardware.fr>
> ---
>  arch/powerpc/include/asm/smu.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

If you're going to send spelling fix patches, please at least fix all the
spelling mistakes in the file at once. I can see several others in this file.

cheers