powerpc/mm: fix missing prototypes in slice.c

[Michael Ellerman]

On Fri, 2018-06-22 at 13:49:48 UTC, Christophe Leroy wrote:
> This patch fixes the following warnings (obtained with make W=1).
> 
> arch/powerpc/mm/slice.c: At top level:
> arch/powerpc/mm/slice.c:682:15: error: no previous prototype for 'arch_get_unmapped_area' [-Werror=missing-prototypes]
>  unsigned long arch_get_unmapped_area(struct file *filp,
>                ^
> arch/powerpc/mm/slice.c:692:15: error: no previous prototype for 'arch_get_unmapped_area_topdown' [-Werror=missing-prototypes]
>  unsigned long arch_get_unmapped_area_topdown(struct file *filp,
>                ^
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/aa5456abdc20568f5da348209148a9

cheers