MIPS: Fix typo resulting in far too long ndelay times.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/delay.h

@@ -15,7 +15,7 @@ extern void __delay(unsigned int loops);
 extern void __ndelay(unsigned int ns);
 extern void __udelay(unsigned int us);
 
-#define ndelay(ns) __udelay(ns)
+#define ndelay(ns) __ndelay(ns)
 #define udelay(us) __udelay(us)
 
 /* make sure "usecs *= ..." in udelay do not overflow. */