sandbox: Add a debug UART

Add support for the debug UART so that sandbox provides build testing for
this feature.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 5fa2725..83f8c94 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -324,6 +324,15 @@
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.
 
+config DEBUG_UART_SANDBOX
+	bool "sandbox"
+	depends on SANDBOX_SERIAL
+	help
+	  Select this to enable the debug UART using the sandbox driver. This
+	  provides basic serial output from the console without needing to
+	  start up driver model. The driver will be available until the real
+	  driver model serial is running.
+
 config DEBUG_UART_STM32
 	bool "STMicroelectronics STM32"
 	depends on STM32_SERIAL
@@ -354,6 +363,7 @@
 config DEBUG_UART_BASE
 	hex "Base address of UART"
 	depends on DEBUG_UART
+	default 0 if DEBUG_UART_SANDBOX
 	help
 	  This is the base address of your UART for memory-mapped UARTs.
 
@@ -363,6 +373,7 @@
 config DEBUG_UART_CLOCK
 	int "UART input clock"
 	depends on DEBUG_UART
+	default 0 if DEBUG_UART_SANDBOX
 	help
 	  The UART input clock determines the speed of the internal UART
 	  circuitry. The baud rate is derived from this by dividing the input