MPC8260: Fix compile problems with "hymod" board

Commit 9d8fbd1b "powerpc, 8xx: Fixup all 8xx u-boot.lds scripts" broke
building of the MPC8260 based "hymod" board.  Fix this.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Murray Jensen <Murray.Jensen@csiro.au>
Cc: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>