drm/i915/gvt: Temporarily disable vfio_edid for BXT/APL

Some disply regs are not setup correctly during HPD for BXT/APL thus
vfio_edid still not working. Temporarily disable the vfio_edid dynamic
update until issue fixed.

Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Colin Xu <colin.xu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20201109073939.758302-1-colin.xu@intel.com