OMAP5 HDMI PHY has some differences compared to OMAP4 HDMI PHY. This
patch creates a features struct which help the driver configure the PHY
based on what SoC it is.

Some of the features aren't currenlty used, but will come in use later.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>