arm-dt: Enable DT proc updates.

This simple patch enables dynamic changes of the DT tree on runtime
to be visible to the device-tree proc interface.
Signed-off-by: NPantelis Antoniou <panto@antoniou-consulting.com>
Acked-by: NRob Herring <rob.herring@calxeda.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

arch/arm/include/asm/prom.h

@@ -11,6 +11,8 @@
 #ifndef __ASMARM_PROM_H
 #define __ASMARM_PROM_H
 
+#define HAVE_ARCH_DEVTREE_FIXUPS
+
 #ifdef CONFIG_OF
 
 extern struct machine_desc *setup_machine_fdt(unsigned int dt_phys);