drm/bridge/synopsys: dw-hdmi: don't clobber drvdata

dw_hdmi shouldn't set drvdata since some drivers might need to store
it's own data there. Rework dw_hdmi in a way to return struct dw_hdmi
instead to store it in drvdata. This way drivers are responsible to
store and pass structure when needed.

Idea was taken from the following commit:
8242ecbd597d ("drm/bridge/synopsys: stop clobbering drvdata")

Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Heiko Stuebner <[email protected]>
Acked-by: Neil Armstrong <[email protected]>
Reviewed-by: Archit Taneja <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Signed-off-by: Jernej Skrabec <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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