phy: Add MIPI D-PHY configuration options

Now that we have some infrastructure for it, allow the MIPI D-PHY phy's to
be configured through the generic functions through a custom structure
added to t

phy: Add MIPI D-PHY configuration options

Now that we have some infrastructure for it, allow the MIPI D-PHY phy's to
be configured through the generic functions through a custom structure
added to the generic union.

The parameters added here are the ones defined in the MIPI D-PHY spec, plus
the number of lanes in use. The current set of parameters should cover all
the potential users.

Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Change-Id: If546789f44b477b9f46507e70ad9a59a4ab35288

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