FROMLIST: drm/rockchip: dw_hdmi: Don't call platform_set_drvdata()

FROMLIST: drm/rockchip: dw_hdmi: Don't call platform_set_drvdata()

The Rockchip dw_hdmi driver just called platform_set_drvdata() to get
your hopes up that maybe, somehow, you'd be able to retrieve the 'struct
rockchip_hdmi' from a pointer to the 'struct device'.  You can't.  When
we call dw_hdmi_bind() the main driver calls dev_set_drvdata(), which
clobbers our setting.

Let's just remove the platform_set_drvdata() to avoid dashing people's
hopes.

(am from https://patchwork.kernel.org/patch/8523401/)

Change-Id: I28c4dcff37f6800b841e0492eb2613dcff7d1c81
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>