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>

include/common.h

@@ -146,7 +146,6 @@ int do_fat_fsload(cmd_tbl_t *, int, int, char * const []);
 int do_ext2load(cmd_tbl_t *, int, int, char * const []);
 
 /* common/cmd_nvedit.c */
-int	env_init     (void);
 void	env_relocate (void);
 int	envmatch     (uchar *, int);