logicpd

Logic PD makes four different system on modules.  This patch will auto
detect the board type and identify the corresponding device tree image.

V2:
Added 'default:' case to switch statement
Since board_late_init() is defined as int, we now return 0

Signed-off-by: Derald Woods <woods.technical@gmail.com>
Signed-off-by: Adam Ford <aford173@gmail.com>