powerpc: Add base support for the Freescale MPC8349E-mITX eval board

Added support for the Freescale MPC8343e-mITX board.  Currently based on the
8343 SYS code.  The 2nd PHY (5-port switch) and SATA are untested (work in
progress).

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>