powerpc: fix sparse warning, include kernel header

[Michael Ellerman]

On Mon, 2017-03-06 at 08:25:31 UTC, "Tobin C. Harding" wrote:
> Spares emits two symbol not declared warnings. The two functions in
> question are declared already in a kernel header.
> 
> Add include directive to include kernel header.
> 
> Signed-off-by: Tobin C. Harding <me at tobin.cc>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/1fc439c81312cd27aed553964c0d9d

cheers