gpu: drm: exynos_hdmi: Remove duplicate initialization of regulator bulk consumer

The helper, devm_regulator_bulk_get() initializes the consumer as NULL,
so this code can be ignored.

Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>