[MIPS] Make irq number allocator generally available for fixing EV64120.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/irq.h b/include/asm-mips/irq.h
index 0ce2a80..35a05ca 100644
--- a/include/asm-mips/irq.h
+++ b/include/asm-mips/irq.h
@@ -74,4 +74,8 @@
                           unsigned long hwmask);
 #endif /* CONFIG_MIPS_MT_SMTC */
 
+extern int allocate_irqno(void);
+extern void alloc_legacy_irqno(void);
+extern void free_irqno(unsigned int irq);
+
 #endif /* _ASM_IRQ_H */