env: Move env_init() to env.h

Move env_init() over to the new header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/board/freescale/p1010rdb/spl.c b/board/freescale/p1010rdb/spl.c
index e07640a..95f8b58 100644
--- a/board/freescale/p1010rdb/spl.c
+++ b/board/freescale/p1010rdb/spl.c
@@ -4,6 +4,7 @@
 
 #include <common.h>
 #include <console.h>
+#include <env.h>
 #include <environment.h>
 #include <ns16550.h>
 #include <malloc.h>