[MIPS] Lasat: fix LASAT_CASCADE_IRQ

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/mach-lasat/irq.h

 #ifndef _ASM_MACH_LASAT_IRQ_H
 #define _ASM_MACH_LASAT_IRQ_H
 
-#define LASAT_CASCADE_IRQ	(MIPS_CPU_IRQ_BASE + 0)
+#define LASAT_CASCADE_IRQ	(MIPS_CPU_IRQ_BASE + 2)
 
 #define LASAT_IRQ_BASE		8
 #define LASAT_IRQ_END		23