boards: arm: nrf52840_mdk_usb_dongle: Convert to v2

Converts the board to hwmv2

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

boards/maker_diary/nrf52840_mdk_usb_dongle/Kconfig.defconfig

@@ -8,9 +8,6 @@
 
 if BOARD_NRF52840_MDK_USB_DONGLE
 
-config BOARD
-	default "nrf52840_mdk_usb_dongle"
-
 # To let the nRF5 bootloader load an application, the application
 # must be linked after Nordic MBR, that is factory-programmed on the board.
 

boards/maker_diary/nrf52840_mdk_usb_dongle/Kconfig.nrf52840_mdk_usb_dongle

@@ -5,5 +5,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_NRF52840_MDK_USB_DONGLE
-	bool "nRF52840 MDK USB DONGLE"
-	depends on SOC_NRF52840_QIAA
+	bool
+	default y
+	select SOC_NRF52840_QIAA

boards/maker_diary/nrf52840_mdk_usb_dongle/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nrf52840_mdk_usb_dongle
+  vendor: Maker Diary
+  socs:
+  - name: nrf52840

boards/maker_diary/nrf52840_mdk_usb_dongle/nrf52840_mdk_usb_dongle_defconfig

@@ -1,9 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_NRF52X=y
-CONFIG_SOC_NRF52840_QIAA=y
-CONFIG_BOARD_NRF52840_MDK_USB_DONGLE=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y