ARM: dts: am43xx-epos-evm: Enable analog audio via simple-card

Use simple card for audio support on ePOS-EVM.
The audio on the board is: McASP1 <-> tlv320aic3111 codec.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>