mpc83xx: Fix the fatal conflict of merge

The commit 9e896478
will cause the mpc8315erdb board can't boot up.

The patch fix that bug, and remove the duplicated #ifdef
CFG_SPCR_TSECEP code and clean the SCCR_TSEC2 for
MPC8313E processor.

Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>