serial: arm_dcc: Remove CONFIG_ARM_DCC_MULTI option

CONFIG_ARM_DCC_MULTI should be also removed in the patch
"serial: Remove CONFIG_SERIAL_MULTI from serial drivers"
(sha1: a3827250606895ec2dd4b8d867342b7cabf3692f)
Because the driver defines serial_* functions
which cause conflict with serial.c (multiple definition of serial_*)

Removing CONFIG_SERIAL_MULTI function also require to define
default_serial_console for cases where another serial driver
is not available in the system.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/stdio_dev.h b/include/stdio_dev.h
index 932d093..9451740 100644
--- a/include/stdio_dev.h
+++ b/include/stdio_dev.h
@@ -99,7 +99,7 @@
 struct stdio_dev* stdio_get_by_name(const char* name);
 struct stdio_dev* stdio_clone(struct stdio_dev *dev);
 
-#ifdef CONFIG_ARM_DCC_MULTI
+#ifdef CONFIG_ARM_DCC
 int drv_arm_dcc_init(void);
 #endif
 #ifdef CONFIG_LCD