stdio: extend "name" to 32 symbols

With limit of 16 symbols very simple device names derived drom device
tree description could not be displayed correctly.

For example "serial0@0xc0fc1000" will be truncated to sensless
"serial0@0xc0fc10" - note dropped tariling zeros.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/stdio_dev.h

@@ -23,7 +23,7 @@
 struct stdio_dev {
 	int	flags;			/* Device flags: input/output/system	*/
 	int	ext;			/* Supported extensions			*/
-	char	name[16];		/* Device name				*/
+	char	name[32];		/* Device name				*/
 
 /* GENERAL functions */