ENGR00157457 - MXC HDMI: Add support for non-CEA spec video modes

ENGR00157457 - MXC HDMI: Add support for non-CEA spec video modes

- Updated PHY configuration code to support ranges of clock frequencies,
rather than just a small set of supported clock frequencies corresponding
to CEA-861 video modes.  This means that PC monitor modes are now
supported.
- Updated color handling code to ensure that a consistent set of
color mode defines are used.
- Fixed bug in how clock disable registers are configured

Signed-off-by: Danny Nold <dannynold@freescale.com>