ppc4xx: Sequoia: Fix TLB reassignment in NAND booting code

This patch fixes a bug in the Sequoia TLB init code to reconfigure
the correct TLB (boot space) after running from RAM. This bug was
introduced with patch 4d332dbe
[ppc4xx: Make Sequoia boot vxWorks] which changed the order of the
TLB in the Sequoia init.S file.

Signed-off-by: Stefan Roese <sr@denx.de>