common: Move get_ticks() function out of common.h

This function belongs in time.h so move it over and add a comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/arm926ejs/armada100/timer.c b/arch/arm/cpu/arm926ejs/armada100/timer.c
index d2ecbd0..6c6948a 100644
--- a/arch/arm/cpu/arm926ejs/armada100/timer.c
+++ b/arch/arm/cpu/arm926ejs/armada100/timer.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <time.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/armada100.h>
 
diff --git a/arch/arm/cpu/arm926ejs/lpc32xx/timer.c b/arch/arm/cpu/arm926ejs/lpc32xx/timer.c
index b3ca686..3a896d1 100644
--- a/arch/arm/cpu/arm926ejs/lpc32xx/timer.c
+++ b/arch/arm/cpu/arm926ejs/lpc32xx/timer.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <time.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/timer.h>
diff --git a/arch/arm/cpu/arm926ejs/mx27/timer.c b/arch/arm/cpu/arm926ejs/mx27/timer.c
index 94b5d45..f51f0df 100644
--- a/arch/arm/cpu/arm926ejs/mx27/timer.c
+++ b/arch/arm/cpu/arm926ejs/mx27/timer.c
@@ -17,6 +17,7 @@
 
 #include <common.h>
 #include <div64.h>
+#include <time.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 
diff --git a/arch/arm/cpu/arm926ejs/mxs/timer.c b/arch/arm/cpu/arm926ejs/mxs/timer.c
index 7492ba4..226401d 100644
--- a/arch/arm/cpu/arm926ejs/mxs/timer.c
+++ b/arch/arm/cpu/arm926ejs/mxs/timer.c
@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <time.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/sys_proto.h>
diff --git a/arch/arm/cpu/arm926ejs/spear/timer.c b/arch/arm/cpu/arm926ejs/spear/timer.c
index e7b5bda..28c09e9 100644
--- a/arch/arm/cpu/arm926ejs/spear/timer.c
+++ b/arch/arm/cpu/arm926ejs/spear/timer.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <time.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/spr_gpt.h>