Correct fixup relocation for mpc8220

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/cpu/mpc8220/config.mk b/cpu/mpc8220/config.mk
index 8e3ba54..c41cafe 100644
--- a/cpu/mpc8220/config.mk
+++ b/cpu/mpc8220/config.mk
@@ -21,7 +21,7 @@
 # MA 02111-1307 USA
 #
 
-PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
+PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -mrelocatable
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 -ffixed-r29 \
 		     -mstring -mcpu=603e -mmultiple