[MIPS] Cleanup leftovers of ARCH_HAS_IRQ_PER_CPU

CONFIG_IRQ_PER_CPU now controls the IRQ_PER_CPU stuff.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 330f6ab..18e15a6 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1649,9 +1649,7 @@
 	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 @@
 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