drm/i915/bios: fix printk format width

s/0x04%x/0x%04x/ to use 0 prefixed width 4 instead of printing 04
verbatim.

Fixes: 51f57481 ("drm/i915/bios: create fake child devices on missing VBT")
Cc: stable@vger.kernel.org # v5.13+
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240905112519.4186408-1-jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>