serial: Kconfig: Add ATMEL_USART option

Add ATMEL_USART option to support to enable the Atmel usart driver
from Kconfig.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 541cf2e..9e48902 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -296,6 +296,13 @@
 	  tree binding to operate, please refer to the document at
 	  doc/device-tree-bindings/serial/qca,ar9330-uart.txt.
 
+config ATMEL_USART
+	bool "Atmel USART support"
+	help
+	  Select this to enable USART support for Atmel SoCs. It can be
+	  configured in the device tree, and input clock frequency can
+	  be got from the clk node.
+
 config FSL_LPUART
 	bool "Freescale LPUART support"
 	help