drm/bridge: dw-hdmi: Fix a build error no member named 'eld'

Refer to commit upstream 3f2532d6 The eld pointer has
been replaced with *(*get_eld)(struct dw_hdmi *hdmi).
This issue is due to merge commit c5b25bdc

Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>