Move strtomhz() to vsprintf.h

At present this function sits in its own file but it does not really
justify it. There are similar string functions in vsprintf.h, so move it
there. Also add the missing function comment.

Use the vsprintf.h include file explicitly where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/atmel/at91sam9261ek/at91sam9261ek.c b/board/atmel/at91sam9261ek/at91sam9261ek.c
index 6f15bc6..2876531 100644
--- a/board/atmel/at91sam9261ek/at91sam9261ek.c
+++ b/board/atmel/at91sam9261ek/at91sam9261ek.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <debug_uart.h>
+#include <vsprintf.h>
 #include <asm/io.h>
 #include <asm/arch/at91sam9261.h>
 #include <asm/arch/at91sam9261_matrix.h>
diff --git a/board/atmel/at91sam9263ek/at91sam9263ek.c b/board/atmel/at91sam9263ek/at91sam9263ek.c
index 2d88217..31bb72c 100644
--- a/board/atmel/at91sam9263ek/at91sam9263ek.c
+++ b/board/atmel/at91sam9263ek/at91sam9263ek.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <debug_uart.h>
+#include <vsprintf.h>
 #include <linux/sizes.h>
 #include <asm/arch/at91sam9263.h>
 #include <asm/arch/at91sam9_smc.h>
diff --git a/board/atmel/at91sam9m10g45ek/at91sam9m10g45ek.c b/board/atmel/at91sam9m10g45ek/at91sam9m10g45ek.c
index 3b277fc..8500431 100644
--- a/board/atmel/at91sam9m10g45ek/at91sam9m10g45ek.c
+++ b/board/atmel/at91sam9m10g45ek/at91sam9m10g45ek.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <debug_uart.h>
+#include <vsprintf.h>
 #include <asm/io.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/at91sam9g45_matrix.h>
diff --git a/board/atmel/at91sam9n12ek/at91sam9n12ek.c b/board/atmel/at91sam9n12ek/at91sam9n12ek.c
index b2bb7ec..51b24e1 100644
--- a/board/atmel/at91sam9n12ek/at91sam9n12ek.c
+++ b/board/atmel/at91sam9n12ek/at91sam9n12ek.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <vsprintf.h>
 #include <asm/io.h>
 #include <asm/arch/at91sam9x5_matrix.h>
 #include <asm/arch/at91sam9_smc.h>
diff --git a/board/atmel/at91sam9rlek/at91sam9rlek.c b/board/atmel/at91sam9rlek/at91sam9rlek.c
index 0393307..4e674d4 100644
--- a/board/atmel/at91sam9rlek/at91sam9rlek.c
+++ b/board/atmel/at91sam9rlek/at91sam9rlek.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <debug_uart.h>
+#include <vsprintf.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <asm/arch/at91sam9rl.h>
diff --git a/board/atmel/common/video_display.c b/board/atmel/common/video_display.c
index cc051d2..5cc5213 100644
--- a/board/atmel/common/video_display.c
+++ b/board/atmel/common/video_display.c
@@ -11,6 +11,7 @@
 #include <version.h>
 #include <video.h>
 #include <video_console.h>
+#include <vsprintf.h>
 #include <asm/io.h>
 #include <asm/arch/clk.h>