ARM: mmp: add missing irqs.h

arch/arm/mach-mmp/gplugd.c:195:13: error: ‘MMP_NR_IRQS’ undeclared here
(not in a function)
make[1]: *** [arch/arm/mach-mmp/gplugd.o] Error 1

Include <mach/irqs.h> to fix this issue.
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-mmp/gplugd.c

@@ -14,6 +14,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach-types.h>
 
+#include <mach/irqs.h>
 #include <mach/pxa168.h>
 #include <mach/mfp-pxa168.h>