[MIPS] Cleanup leftovers of ARCH_HAS_IRQ_PER_CPU

CONFIG_IRQ_PER_CPU now controls the IRQ_PER_CPU stuff.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1649,9 +1649,7 @@ config GENERIC_IRQ_PROBE
 	default y
 
 config IRQ_PER_CPU
-	depends on SMP
 	bool
-	default y
 
 #
 # - Highmem only makes sense for the 32-bit kernel.
@@ -1719,6 +1717,7 @@ source "mm/Kconfig"
 config SMP
 	bool "Multi-Processing support"
 	depends on SYS_SUPPORTS_SMP
+	select IRQ_PER_CPU
 	help
 	  This enables support for systems with more than one CPU. If you have
 	  a system with only one CPU, like most personal computers, say N. If

include/asm-mips/irq.h

@@ -76,8 +76,4 @@ extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
                           unsigned long hwmask);
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-#ifdef CONFIG_SMP
-#define ARCH_HAS_IRQ_PER_CPU
-#endif
-
 #endif /* _ASM_IRQ_H */