drm/amdgpu: Fix vram_page_split parameter description

[deathsimple@xxxxxxxxxxx (Christian König)]

Reviewed-by: Christian König <christian.koenig at amd.com>.

Regards,
Christian.

Am 28.06.2017 um 21:26 schrieb Kent Russell:
> The default was changed to 512 from 1024, but the default in the
> description wasn't updated.
>
>  Kent
>
>
>
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