[POWERPC] Add DTS for MPC8349E-mITX board

Add the DTS for the Freescale MPC 8349E-mITX reference board.  Contact
Vitesse for the driver for the VSC 7385.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>