Add notrace to lib/ucmpdi2.c

As part of the MIPS conversion to use the generic GCC library routines,
Matt Redfearn discovered that I'd missed a notrace on __ucmpdi2().  This
patch rectifies the problem.
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Matt Redfearn <matt.redfearn@mips.com>
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Matt Redfearn <matt.redfearn@mips.com>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/19048/Signed-off-by: James Hogan <jhogan@kernel.org>

lib/ucmpdi2.c

@@ -17,7 +17,7 @@
 #include <linux/module.h>
 #include <linux/libgcc.h>
 
-word_type __ucmpdi2(unsigned long long a, unsigned long long b)
+word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b)
 {
 	const DWunion au = {.ll = a};
 	const DWunion bu = {.ll = b};