MIPS: lantiq: split up IRQ IM ranges

Up to now all our SoCs had the 5 IM ranges in a consecutive order. To accomodate
the SVIP we need to support IM ranges that are scattered inside the register range.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4237/

arch/mips/include/asm/mach-lantiq/falcon/falcon_irq.h

@@ -20,4 +20,6 @@
 
 #define MIPS_CPU_TIMER_IRQ			7
 
+#define MAX_IM			5
+
 #endif /* _FALCON_IRQ__ */

arch/mips/include/asm/mach-lantiq/xway/lantiq_irq.h

@@ -21,4 +21,6 @@
 
 #define MIPS_CPU_TIMER_IRQ	7
 
+#define MAX_IM			5
+
 #endif