mpc512x: remove dead code

The prt_mpc512x_clks() function isn't referenced
anywhere and its prototype is wrong. Remove it.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/arch/powerpc/cpu/mpc512x/speed.c b/arch/powerpc/cpu/mpc512x/speed.c
index 9a8f315..6761877 100644
--- a/arch/powerpc/cpu/mpc512x/speed.c
+++ b/arch/powerpc/cpu/mpc512x/speed.c
@@ -151,9 +151,3 @@
 	"print clock configuration",
 	"    clocks"
 );
-
-int prt_mpc512x_clks (void)
-{
-	do_clocks (NULL, 0, 0, NULL);
-	return (0);
-}
diff --git a/include/common.h b/include/common.h
index 28aa4b9..de75da2 100644
--- a/include/common.h
+++ b/include/common.h
@@ -648,9 +648,6 @@
 #elif defined(CONFIG_MPC5xxx)
 int	prt_mpc5xxx_clks (void);
 #endif
-#if defined(CONFIG_MPC512X)
-int	prt_mpc512xxx_clks (void);
-#endif
 #if defined(CONFIG_MPC8220)
 int	prt_mpc8220_clks (void);
 #endif