Rename the files to have names consistent across OMAP boards.

Update the Makefile to use the new name.
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

The 4430 and 4460 version of PandaBoard mostly the same with
exception at least in audio setup.
Use the omap4-panda.dts file as a base and only override the differences
between the revisions.
For audio it is the name of the sound card and the routing information.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>