dm: am33xx: Move to driver model for GPIO and serial

Adjust the configuration for the am33xx boards, including beaglebone black
to use driver model.

This can be extended to other OMAP boards once platform data is provided
for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Tom Rini <trini@ti.com>
1 file changed