Update MPC8349ITX*_config to place config.tmp in right place.

MPC834ITX*_config does not store config.tmp at the correct locatation,
causing MPC8349ITXGP to have the wrong TEXT_BASE.

Signed-off-by: Sam Sparks <SSparks@twacs.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>