[MIPS] Export __ucmpdi2 to modules.

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

arch/mips/lib/ucmpdi2.c

@@ -17,3 +17,5 @@ word_type __ucmpdi2(unsigned long long a, unsigned long long b)
 		return 2;
 	return 1;
 }
+
+EXPORT_SYMBOL(__ucmpdi2);