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/Makefile b/drivers/serial/Makefile
index 76b1811..e26b644 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -36,6 +36,7 @@
 obj-$(CONFIG_ATMEL_USART) += atmel_usart.o
 obj-$(CONFIG_BCM6345_SERIAL) += serial_bcm6345.o
 obj-$(CONFIG_COREBOOT_SERIAL) += serial_coreboot.o
+obj-$(CONFIG_CORTINA_UART) += serial_cortina.o
 obj-$(CONFIG_EFI_APP) += serial_efi.o
 obj-$(CONFIG_LPC32XX_HSUART) += lpc32xx_hsuart.o
 obj-$(CONFIG_MCFUART) += mcfuart.o