drm/hisilicon/hibmc: move display contrl config to hibmc_probe()

drm/hisilicon/hibmc: move display contrl config to hibmc_probe()

If there's no VGA output, this encoder modeset won't be called, which
will cause displaying data from GPU being cut off. It's actually a
common display config for DP and VGA, so move the vdac encoder modeset
to driver load stage.

Removed invalid bit configurations from `hibmc_display_ctrl`

Fixes: 5294967f4ae4 ("drm/hisilicon/hibmc: Add support for VDAC")
Signed-off-by: Lin He <helin52@huawei.com>
Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260509032302.2057227-4-shiyongbang@huawei.com