MAKEALL: add missing 512x boards in ppc

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

MAKEALL

@@ -378,6 +378,7 @@ LIST_7xx="		\
 
 LIST_ppc="		\
 	${LIST_5xx}	\
+	${LIST_512x}	\
 	${LIST_5xxx}	\
 	${LIST_8xx}	\
 	${LIST_8220}	\