MIPS: csrc-r4k: Fix declaration depending on the wrong CONFIG_ symbol.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/time.h b/arch/mips/include/asm/time.h
index d3bd5c5..9601ea9 100644
--- a/arch/mips/include/asm/time.h
+++ b/arch/mips/include/asm/time.h
@@ -63,7 +63,7 @@
 /*
  * Initialize the count register as a clocksource
  */
-#ifdef CONFIG_CEVT_R4K
+#ifdef CONFIG_CSRC_R4K
 extern int init_mips_clocksource(void);
 #else
 static inline int init_mips_clocksource(void)