serial: serial_cortina: add UART DM driver for CAxxxx SoCs

Add serial UART driver support for all Cortina Access
CAxxxx family of SoCs.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Jason Li <jason.li@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index cd2e098..90e3983 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -553,6 +553,13 @@
 	  a serial console on any platform without needing to change the
 	  device tree, etc.
 
+config CORTINA_UART
+	bool "Cortina UART support"
+	depends on DM_SERIAL
+	help
+	  Select this to enable UART support for Cortina-Access UART devices
+	  found on CAxxxx SoCs.
+
 config FSL_LINFLEXUART
 	bool "Freescale Linflex UART support"
 	depends on DM_SERIAL