[usb-moded] Move some functions defintions out of usb-moded.h

To be able to build without depending on glib, two functions
which are now defined in usb_moded.c anyway now, have been moved
to the "correct" header file.

Signed-off-by: Philippe De Swert <philippe.deswert@jollamobile.com>

src/usb_moded-modes.h

@@ -29,7 +29,3 @@
 #define MODE_DEVELOPER		"developer_mode"
 #define MODE_MTP		"mtp_mode"
 #define MODE_CHARGER		"dedicated_charger"
-
-/* due to the use of the modelist these functions are defined in usb_moded.c */
-gchar *get_mode_list(void);
-int valid_mode(const char *mode);

src/usb_moded.h

@@ -65,5 +65,7 @@ struct mode_list_elem * get_usb_mode_data(void);
 gboolean get_usb_connection_state(void);
 void set_usb_connection_state(gboolean state);
 void set_charger_connected(gboolean state);
+gchar *get_mode_list(void);
+int valid_mode(const char *mode);
 
 #endif /* USB_MODED_H */