[MIPS] Define ARCH_HAS_IRQ_PER_CPU for all SMP systems.

Without SMTC on non-Malta will blow up.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/irq.h b/include/asm-mips/irq.h
index d35c617..896550b 100644
--- a/include/asm-mips/irq.h
+++ b/include/asm-mips/irq.h
@@ -76,4 +76,8 @@
                           unsigned long hwmask);
 #endif /* CONFIG_MIPS_MT_SMTC */
 
+#ifdef CONFIG_SMP
+#define ARCH_HAS_IRQ_PER_CPU
+#endif
+
 #endif /* _ASM_IRQ_H */