fdt/sunxi: Remove OF_STDOUT_PATH

OF_STDOUT_PATH was meant to hold the devicetree path to the serial
console, to be put into the linux,stdout-path property of the chosen node.

The only user of that was sunxi, and it was actually wrong for years
there: the paths hardcoded in sunxi_common.h were not matching the DTs,
evident by the leading 0's in nodenames, which have been removed years
ago.

On top of that, "linux,stdout-path" is now deprecated for a while (Linux
commit 2a9d832cc9aae from November 2014), and also all modern DTs
(including those included in U-Boot) carry a "stdout-path" property
already.

So remove the stanza from sunxi_common.h, and, since this was the last
user, also remove the associated bits from the rest of U-Boot.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 1a1b408..08d540b 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -127,14 +127,7 @@
 	return offset;
 }
 
-/* rename to CONFIG_OF_STDOUT_PATH ? */
-#if defined(OF_STDOUT_PATH)
-static int fdt_fixup_stdout(void *fdt, int chosenoff)
-{
-	return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
-			      OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
-}
-#elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
+#if defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
 static int fdt_fixup_stdout(void *fdt, int chosenoff)
 {
 	int err;