omap: rx51: Add supply and data for the tpa6130a2 headphoneamplifier

With these and upcoming change to tpa6130a2 driver it's possible to add
support for the TPA6130A2 headphone amplifier.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>