[nrf toup][nrfconnect] Don't select BOOTLOADER_MCUBOOT for nRF52840 Dongle

Don't use `CHIP_BOOTLOADER_MCUBOOT` for dongle.

Signed-off-by: Adrian Gielniewski <[email protected]>

Author: adigie

config/nrfconnect/chip-module/Kconfig

@@ -52,7 +52,7 @@ config CHIP_NFC_COMMISSIONING
 
 choice CHIP_BOOTLOADER
 	prompt "Bootloader implementation for Matter purposes"
-	default CHIP_BOOTLOADER_MCUBOOT if !BOARD_NRF21540DK
+	default CHIP_BOOTLOADER_MCUBOOT if !BOARD_NRF21540DK && !BOARD_NRF52840DONGLE
 	default CHIP_BOOTLOADER_NONE
 
 config CHIP_BOOTLOADER_MCUBOOT