ARC: [arcompact] fix bitrot with 2 levels of interrupt

Signed-off-by: Vineet Gupta <[e-mail]>

arch/arc/include/asm/irqflags-compact.h

···
 /*
  * Unconditionally Enable IRQs
  */
+#ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
+extern void arch_local_irq_enable(void);
+#else
 static inline void arch_local_irq_enable(void)
 {
 	unsigned long temp;
···
 	: "n"((STATUS_E1_MASK | STATUS_E2_MASK))
 	: "cc", "memory");
 }
-
+#endif
 
 /*
  * Unconditionally Disable IRQs