boot: Add config for dongle bare variant

Add a configuration file for the nRF52840 dongle bare variant.

Signed-off-by: Tomasz Chyrowicz <tomasz.chyrowicz@nordicsemi.no>

Author: tomchy

boot/zephyr/boards/nrf52840dongle_nrf52840_bare.conf

@@ -0,0 +1,26 @@
+# The UART is used for Serial Recovery, so logging requires
+# an RTT console, which is not available out of the box on this board.
+# Disable logging.
+CONFIG_LOG=n
+
+# Serial
+CONFIG_CONSOLE=n
+CONFIG_SERIAL=y
+CONFIG_UART_NRFX=n
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_UART_LINE_CTRL=y
+
+# MCUBoot serial
+CONFIG_GPIO=y
+CONFIG_MCUBOOT_SERIAL=y
+CONFIG_BOOT_SERIAL_CDC_ACM=y
+
+# Required by USB
+CONFIG_MULTITHREADING=y
+
+# USB
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_REMOTE_WAKEUP=n
+CONFIG_USB_DEVICE_PRODUCT="MCUBOOT"
+
+CONFIG_NORDIC_QSPI_NOR=n