[MIPS] SMTC: Fix cut'n'paste bug in Kconfig.debug

This effectivly turned the SMTC_IDLE_HOOK_DEBUG debug option into a no-op.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index 72d5c19..3efe117 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -37,7 +37,7 @@
 
 	  This option will slow down process creation somewhat.
 
-config CONFIG_SMTC_IDLE_HOOK_DEBUG
+config SMTC_IDLE_HOOK_DEBUG
 	bool "Enable additional debug checks before going into CPU idle loop"
 	depends on DEBUG_KERNEL && MIPS_MT_SMTC
 	help