[ARM] 5555/1: RealView: Include asm/smp_twd.h in realview-pbx.c

This header file is needed for twd_base.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-realview/realview_pbx.c

@@ -27,6 +27,7 @@
 #include <asm/irq.h>
 #include <asm/leds.h>
 #include <asm/mach-types.h>
+#include <asm/smp_twd.h>
 #include <asm/hardware/gic.h>
 #include <asm/hardware/cache-l2x0.h>