drm/i915: Remove leftover cnl SAGV block time

GLK doesn't support SAGV, so with CNL gone there is no
use for having a DISPLAY_VER==10 SAGV block time in the code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220308173230.4182-2-ville.syrjala@linux.intel.com


Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>