stdio: Pass device pointer to stdio methods

At present stdio device functions do not get any clue as to which stdio
device is being acted on. Some implementations go to great lengths to work
around this, such as defining a whole separate set of functions for each
possible device.

For driver model we need to associate a stdio_dev with a device. It doesn't
seem possible to continue with this work-around approach.

Instead, add a stdio_dev pointer to each of the stdio member functions.

Note: The serial drivers have the same problem, but it is not strictly
necessary to fix that to get driver model running. Also, if we convert
serial over to driver model the problem will go away.

Code size increases by 244 bytes for Thumb2 and 428 for PowerPC.

22: stdio: Pass device pointer to stdio methods
       arm: (for 2/2 boards)  all +244.0  bss -4.0  text +248.0
   powerpc: (for 1/1 boards)  all +428.0  text +428.0

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/MHPC.h b/include/configs/MHPC.h
index 6314b53..d45be0f 100644
--- a/include/configs/MHPC.h
+++ b/include/configs/MHPC.h
@@ -96,8 +96,8 @@
 #define CONFIG_VIDEO_LOGO
 
 #define VIDEO_KBD_INIT_FCT	0		/* no KBD dev on MHPC - use serial */
-#define VIDEO_TSTC_FCT		serial_tstc
-#define VIDEO_GETC_FCT		serial_getc
+#define VIDEO_TSTC_FCT		serial_stub_tstc
+#define VIDEO_GETC_FCT		serial_stub_getc
 
 #define CONFIG_BR0_WORKAROUND	1