powerpc/mpc83xx: add support for new SPL

This adds arch support for PPC mpc83xx to boot "minimal" (4K) SPLs
using the new infrastructure.

Existing nand_spl targets are updated to deal with the name change
from nand_init.c to spl_minimal.c (as in theory this isn't limited
to NAND anymore).

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 844fe86..86cf02a 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -47,7 +47,8 @@
 endif
 
 ifdef MINIMAL
-COBJS-y += cache.o
+COBJS-y += cache.o time.o
+SOBJS-y += ticks.o
 else
 
 SOBJS-y	+= ppcstring.o