drivers: uart: microchip: add dma support

dma support added for uart

Signed-off-by: Fabin V Martin <[email protected]>

Author: fabin-mchp

drivers/serial/Kconfig.mchp

@@ -2,11 +2,22 @@
 # SPDX-License-Identifier: Apache-2.0
 
 config UART_MCHP_SERCOM_G1
-	bool "Microchip SERCOM G1 UART driver"
+	bool
 	default y
 	depends on DT_HAS_MICROCHIP_SERCOM_G1_UART_ENABLED
 	select SERIAL_HAS_DRIVER
 	select SERIAL_SUPPORT_INTERRUPT
+	select SERIAL_SUPPORT_ASYNC
 	select PINCTRL
 	help
 	  This option enables UART driver for group (g1) of SERCOM peripherals.
+
+if UART_MCHP_SERCOM_G1
+
+config UART_MCHP_ASYNC
+	bool
+	default y
+	depends on UART_ASYNC_API
+	depends on DMA
+
+endif # UART_MCHP_SERCOM_G1