[PATCH] env: add prototypes for weak function

[Patrick Delaunay]

This patch adds prototypes for several weak functions:
- env_ext4_get_intf
- env_ext4_get_dev_part
- env_get_location

It solves the following warnings when compiling with W=1
on stm32mp1 board:

board/st/stm32mp1/stm32mp1.c:849:19: warning: no previous prototype for 'env_get_location' [-Wmissing-prototypes]
 enum env_location env_get_location(enum env_operation op, int prio)
                   ^~~~~~~~~~~~~~~~
board/st/stm32mp1/stm32mp1.c:876:13: warning: no previous prototype for 'env_ext4_get_intf' [-Wmissing-prototypes]
 const char *env_ext4_get_intf(void)
             ^~~~~~~~~~~~~~~~~
board/st/stm32mp1/stm32mp1.c:889:13: warning: no previous prototype for 'env_ext4_get_dev_part' [-Wmissing-prototypes]
 const char *env_ext4_get_dev_part(void)
             ^~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

 include/env_internal.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/env_internal.h b/include/env_internal.h
index 90a4df8a72..874ef48646 100644
--- a/include/env_internal.h
+++ b/include/env_internal.h
@@ -209,6 +209,14 @@ struct env_driver {
 
 extern struct hsearch_data env_htab;
 
+/* allows to set ext4 interface */
+const char *env_ext4_get_intf(void);
+
+/* allows to set ext4 device and partition */
+const char *env_ext4_get_dev_part(void);
+
+/* Returns the best env location for a board */
+enum env_location env_get_location(enum env_operation op, int prio);
 #endif /* DO_DEPS_ONLY */
 
 #endif /* _ENV_INTERNAL_H_ */
-- 
2.17.1