drm/xe: Fix xe_guc_ads.h

We don't need to include xe_guc_ads_types.h here.
Use forward declaration instead.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240513084218.2084-3-michal.wajdeczko@intel.com