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/common/spl/spl_ext.c b/common/spl/spl_ext.c
index fe05223..2a62522 100644
--- a/common/spl/spl_ext.c
+++ b/common/spl/spl_ext.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 
 #include <common.h>
+#include <env.h>
 #include <spl.h>
 #include <asm/u-boot.h>
 #include <ext4fs.h>