powerpc: include setup.h header file to fix warnings

[Michael Ellerman]

On Fri, 2018-06-22 at 19:26:53 UTC, Mathieu Malaterre wrote:
> Make sure to include setup.h to provide the following prototypes:
> 
> - irqstack_early_init
> - setup_power_save
> - initialize_cache_info
> 
> Fix the following warnings (treated as error in W=1):
> 
>   arch/powerpc/kernel/setup_32.c:198:13: error: no previous prototype for ‘irqstack_early_init’ [-Werror=missing-prototypes]
>   arch/powerpc/kernel/setup_32.c:238:13: error: no previous prototype for ‘setup_power_save’ [-Werror=missing-prototypes]
>   arch/powerpc/kernel/setup_32.c:253:13: error: no previous prototype for ‘initialize_cache_info’ [-Werror=missing-prototypes]
> 
> Signed-off-by: Mathieu Malaterre <malat at debian.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/f2c6d0d1092e3da2bd36c768777e88

cheers