Audio-Add Support for Analog Audio on 3.12

These patches add analog audio support for
the 3.12 kernel, and they modify the beagle
defconfigs to build aic and hdmi audio
drivers into the kernel image.

Testing with Arduino Tre confirms audio
playback through the 3.5mm output and
record through the 3.5mm input.

Platform: AM335 Arduino Tre with onboard
TLV320AIC3104 audio codec running Angstrom
with the Beagle Linux 3.12 Kernel.

TODO: Test on BBB with audio cape and add
audio cape DT overlay.