drm/exynos: fixed connector flag with hpd and interlace scan for hdmi

hdmi display in exynos supports hotplug event and interlace scan mode

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>