common: Move clock functions into a new file

These three clock functions don't use driver model and should be migrated.
In the meantime, create a new file to hold them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/cpu/mpc83xx/fdt.c b/arch/powerpc/cpu/mpc83xx/fdt.c
index b487e31..5c68535 100644
--- a/arch/powerpc/cpu/mpc83xx/fdt.c
+++ b/arch/powerpc/cpu/mpc83xx/fdt.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <linux/libfdt.h>
 #include <fdt_support.h>
 #include <asm/processor.h>
diff --git a/arch/powerpc/cpu/mpc83xx/speed.c b/arch/powerpc/cpu/mpc83xx/speed.c
index 93af7f4..e2fc0b1 100644
--- a/arch/powerpc/cpu/mpc83xx/speed.c
+++ b/arch/powerpc/cpu/mpc83xx/speed.c
@@ -9,6 +9,7 @@
 #ifndef CONFIG_CLK_MPC83XX
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <mpc83xx.h>
 #include <command.h>
 #include <vsprintf.h>
diff --git a/arch/powerpc/cpu/mpc83xx/spl_minimal.c b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
index 133f7ab..75b03f3 100644
--- a/arch/powerpc/cpu/mpc83xx/spl_minimal.c
+++ b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <mpc83xx.h>
 
 #include "lblaw/lblaw.h"
diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index db12aef..4c3693e 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <env.h>
 #include <linux/libfdt.h>
 #include <fdt_support.h>
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index 0c5252e..773ae08 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -574,8 +574,7 @@
 #endif
 }
 
-
-int get_clocks (void)
+int get_clocks(void)
 {
 	sys_info_t sys_info;
 #ifdef CONFIG_ARCH_MPC8544
@@ -653,7 +652,7 @@
  * get_bus_freq
  * return system bus freq in Hz
  *********************************************/
-ulong get_bus_freq (ulong dummy)
+ulong get_bus_freq(ulong dummy)
 {
 	return gd->bus_clk;
 }
diff --git a/arch/powerpc/cpu/mpc86xx/speed.c b/arch/powerpc/cpu/mpc86xx/speed.c
index 434c4f3..5001445 100644
--- a/arch/powerpc/cpu/mpc86xx/speed.c
+++ b/arch/powerpc/cpu/mpc86xx/speed.c
@@ -9,6 +9,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <mpc86xx.h>
 #include <asm/processor.h>
 #include <asm/io.h>
diff --git a/arch/powerpc/cpu/mpc8xx/speed.c b/arch/powerpc/cpu/mpc8xx/speed.c
index 5a8fc1f..77d4f8e 100644
--- a/arch/powerpc/cpu/mpc8xx/speed.c
+++ b/arch/powerpc/cpu/mpc8xx/speed.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <clock_legacy.h>
 #include <mpc8xx.h>
 #include <asm/processor.h>
 #include <asm/io.h>