drm/i915/fbc: Implement Wa_16011863758 for icl+

drm/i915/fbc: Implement Wa_16011863758 for icl+

There's some kind of weird corner cases in FBC which requires
FBC segments to be separated by at least one extra cacheline.
Make sure that is present.

v2: Respin to fit in with skl_fbc_min_cfb_stride()
v3: Make it build

Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com> #v1
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210921181245.15091-1-ville.syrjala@linux.intel.com