ARM: 7344/1: pxa: mainstone: add missing include for IRQ_BOARD_START

As part of mach/irqs.h include removal from sparse, mainstone.h was missed.
This fixes the compile of the pcmcia driver.
Signed-off-by: NRob Herring <rob.herring@calxeda.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/include/mach/mainstone.h

@@ -13,6 +13,8 @@
 #ifndef ASM_ARCH_MAINSTONE_H
 #define ASM_ARCH_MAINSTONE_H
 
+#include <mach/irqs.h>
+
 #define MST_ETH_PHYS		PXA_CS4_PHYS
 
 #define MST_FPGA_PHYS		PXA_CS2_PHYS