fastboot: Remove <common.h> and add needed includes

Remove <common.h> from this driver directory and when needed
add missing include files directly.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/fastboot/fb_getvar.c b/drivers/fastboot/fb_getvar.c
index f65519c..93cbd59 100644
--- a/drivers/fastboot/fb_getvar.c
+++ b/drivers/fastboot/fb_getvar.c
@@ -3,7 +3,6 @@
  * Copyright (C) 2016 The Android Open Source Project
  */
 
-#include <common.h>
 #include <env.h>
 #include <fastboot.h>
 #include <fastboot-internal.h>
@@ -12,6 +11,7 @@
 #include <fs.h>
 #include <part.h>
 #include <version.h>
+#include <vsprintf.h>
 #include <linux/printk.h>
 
 static void getvar_version(char *var_parameter, char *response);