[RFT] powerpc/boot: Fix missing crc32poly.h when building with KERNEL_XZ

[Krzysztof Kozlowski]

On Wed, 29 Aug 2018 at 09:32, Krzysztof Kozlowski <krzk at kernel.org> wrote:
>
> After commit faa16bc404d7 ("lib: Use existing define with
> polynomial") the lib/xz/xz_crc32.c includes a header from include/linux
> directory thus any other user of this code should define proper include
> path.
>
> This fixes the build error on powerpc with CONFIG_KERNEL_XZ:
>
>     In file included from ../arch/powerpc/boot/../../../lib/decompress_unxz.c:233:0,
>                      from ../arch/powerpc/boot/decompress.c:42:
>     ../arch/powerpc/boot/../../../lib/xz/xz_crc32.c:18:29: fatal error: linux/crc32poly.h: No such file or directory
>
> Reported-by: Michal Kubecek <mkubecek at suse.cz>

Reported earlier by Kbuild:
https://lkml.org/lkml/2018/8/23/47

for the credits:
Reported-by: kbuild test robot <lkp at intel.com>

Best regards,
Krzysztof