drm: bridge: dw-hdmi: Create PHY operations

The HDMI TX controller support different PHYs whose programming
interface can vary significantly, especially with vendor PHYs that are
not provided by Synopsys. To support them, create a PHY operation
structure that can be provided by the platform glue layer. The existing
PHY handling code (limited to Synopsys PHY support) is refactored into a
set of default PHY operations that are used automatically when the
platform glue doesn't provide its own operations.

Signed-off-by: Laurent Pinchart <[email protected]>
Tested-by: Neil Armstrong <[email protected]>
Reviewed-by: Jose Abreu <[email protected]>
Signed-off-by: Archit Taneja <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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