powerpc/85xx: Move RESET_VECTOR_ADDRESS into config.h

Rather than defining it config.mk we can set it in config.h and remove
config.mk from several boards that don't need it.

We mimic what 4xx does and introduce CONFIG_RESET_VECTOR_ADDRESS for
config.h to set.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/MPC8572DS.h b/include/configs/MPC8572DS.h
index ea15831..e6b60cf 100644
--- a/include/configs/MPC8572DS.h
+++ b/include/configs/MPC8572DS.h
@@ -48,6 +48,10 @@
 #define CONFIG_SYS_TEXT_BASE	0xeff80000
 #endif
 
+#ifndef CONFIG_RESET_VECTOR_ADDRESS
+#define CONFIG_RESET_VECTOR_ADDRESS	0xeffffffc
+#endif
+
 #ifndef CONFIG_SYS_MONITOR_BASE
 #define CONFIG_SYS_MONITOR_BASE	CONFIG_SYS_TEXT_BASE	/* start of monitor */
 #endif