env: Move env_get() to env.h

Move env_get() over to the new header file.

Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/ati_radeon_fb.c b/drivers/video/ati_radeon_fb.c
index 87557e5..6fce033 100644
--- a/drivers/video/ati_radeon_fb.c
+++ b/drivers/video/ati_radeon_fb.c
@@ -19,6 +19,7 @@
 
 #include <command.h>
 #include <bios_emul.h>
+#include <env.h>
 #include <pci.h>
 #include <asm/processor.h>
 #include <linux/errno.h>
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index ac02921..e5c077e 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -65,6 +65,7 @@
  */
 
 #include <common.h>
+#include <env.h>
 #include <fdtdec.h>
 #include <gzip.h>
 #include <version.h>
diff --git a/drivers/video/mb862xx.c b/drivers/video/mb862xx.c
index 1a3c970..301c1f0 100644
--- a/drivers/video/mb862xx.c
+++ b/drivers/video/mb862xx.c
@@ -12,6 +12,7 @@
 #include <common.h>
 
 #include <asm/io.h>
+#include <env.h>
 #include <pci.h>
 #include <video_fb.h>
 #include "videomodes.h"
diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index 176ae70..a984443 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -6,6 +6,7 @@
  * HALE electronic GmbH, <helmut.raiger@hale.at>
  */
 #include <common.h>
+#include <env.h>
 #include <malloc.h>
 #include <video_fb.h>
 
diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index 6c9a7c0..6922a13 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -6,6 +6,7 @@
  */
 #include <common.h>
 #include <dm.h>
+#include <env.h>
 #include <linux/errno.h>
 #include <malloc.h>
 #include <video.h>
diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c
index d761432..ac25b45 100644
--- a/drivers/video/videomodes.c
+++ b/drivers/video/videomodes.c
@@ -58,6 +58,7 @@
 
 #include <common.h>
 #include <edid.h>
+#include <env.h>
 #include <errno.h>
 #include <linux/ctype.h>