stdio: constify "name" arg in public api

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

common/console.c

@@ -479,7 +479,7 @@ inline void dbg(const char *fmt, ...)
 
 /** U-Boot INIT FUNCTIONS *************************************************/
 
-struct stdio_dev *search_device(int flags, char *name)
+struct stdio_dev *search_device(int flags, const char *name)
 {
 	struct stdio_dev *dev;
 
@@ -491,7 +491,7 @@ struct stdio_dev *search_device(int flags, char *name)
 	return NULL;
 }
 
-int console_assign(int file, char *devname)
+int console_assign(int file, const char *devname)
 {
 	int flag;
 	struct stdio_dev *dev;

common/stdio.c

@@ -105,7 +105,7 @@ struct list_head* stdio_get_list(void)
 	return &(devs.list);
 }
 
-struct stdio_dev* stdio_get_by_name(char* name)
+struct stdio_dev* stdio_get_by_name(const char *name)
 {
 	struct list_head *pos;
 	struct stdio_dev *dev;
@@ -155,7 +155,7 @@ int stdio_register (struct stdio_dev * dev)
  * returns 0 if success, -1 if device is assigned and 1 if devname not found
  */
 #ifdef	CONFIG_SYS_STDIO_DEREGISTER
-int stdio_deregister(char *devname)
+int stdio_deregister(const char *devname)
 {
 	int l;
 	struct list_head *pos;

include/common.h

@@ -655,7 +655,7 @@ char *	strmhz(char *buf, long hz);
 /* common/console.c */
 int	console_init_f(void);	/* Before relocation; uses the serial  stuff	*/
 int	console_init_r(void);	/* After  relocation; uses the console stuff	*/
-int	console_assign (int file, char *devname);	/* Assign the console	*/
+int	console_assign(int file, const char *devname);	/* Assign the console	*/
 int	ctrlc (void);
 int	had_ctrlc (void);	/* have we had a Control-C since last clear? */
 void	clear_ctrlc (void);	/* clear the Control-C condition */

include/iomux.h

@@ -43,6 +43,6 @@ extern int cd_count[MAX_FILES];
 
 int iomux_doenv(const int, const char *);
 void iomux_printdevs(const int);
-struct stdio_dev *search_device(int, char *);
+struct stdio_dev *search_device(int, const char *);
 
 #endif /* _IO_MUX_H */

include/stdio_dev.h

@@ -93,10 +93,10 @@ int	stdio_register (struct stdio_dev * dev);
 int	stdio_init (void);
 void	stdio_print_current_devices(void);
 #ifdef CONFIG_SYS_STDIO_DEREGISTER
-int	stdio_deregister(char *devname);
+int	stdio_deregister(const char *devname);
 #endif
 struct list_head* stdio_get_list(void);
-struct stdio_dev* stdio_get_by_name(char* name);
+struct stdio_dev* stdio_get_by_name(const char* name);
 struct stdio_dev* stdio_clone(struct stdio_dev *dev);
 
 #ifdef CONFIG_ARM_DCC_MULTI