drm/i915: Replace a memset() with zero initialization

Declaring a struct and immediately zeroing it with memset()
seems a bit silly to me. Just zero initialize the struct
when declaring it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231124082735.25470-2-ville.syrjala@linux.intel.com


Reviewed-by: Mika Kahola <mika.kahola@intel.com>