[nrf noup] boot: zephyr: move thingy53_nrf5340_cpuapp.conf downstream

Moved the board configuration for Thingy:53 Application Core to the
nRF Connect SDK MCUboot downstream repository. The configuration file
contains references to the Kconfig modules that are only available in
the nRF Connect SDK. The current configuration is set up to work in the
nRF Connect SDK environment and cannot be used upstream.

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>

boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf

@@ -0,0 +1,72 @@
+CONFIG_SIZE_OPTIMIZATIONS=y
+
+CONFIG_SYSTEM_CLOCK_NO_WAIT=y
+CONFIG_PM=n
+
+CONFIG_MAIN_STACK_SIZE=10240
+CONFIG_MBEDTLS_CFG_FILE="mcuboot-mbedtls-cfg.h"
+
+CONFIG_BOOT_MAX_IMG_SECTORS=2048
+CONFIG_BOOT_SIGNATURE_TYPE_RSA=y
+
+# Flash
+CONFIG_FLASH=y
+CONFIG_BOOT_ERASE_PROGRESSIVELY=y
+CONFIG_SOC_FLASH_NRF_EMULATE_ONE_BYTE_WRITE_ACCESS=y
+CONFIG_FPROTECT=y
+
+# Serial
+CONFIG_SERIAL=y
+CONFIG_UART_LINE_CTRL=y
+
+# MCUBoot serial
+CONFIG_GPIO=y
+CONFIG_MCUBOOT_SERIAL=y
+CONFIG_MCUBOOT_SERIAL_DIRECT_IMAGE_UPLOAD=y
+CONFIG_BOOT_SERIAL_CDC_ACM=y
+
+# Required by QSPI
+CONFIG_NORDIC_QSPI_NOR=y
+CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
+CONFIG_NORDIC_QSPI_NOR_STACK_WRITE_BUFFER_SIZE=16
+
+# Required by USB and QSPI
+CONFIG_MULTITHREADING=y
+
+# USB
+CONFIG_USB_DEVICE_REMOTE_WAKEUP=n
+CONFIG_USB_DEVICE_MANUFACTURER="Nordic Semiconductor ASA"
+CONFIG_USB_DEVICE_PRODUCT="Bootloader Thingy:53"
+CONFIG_USB_DEVICE_VID=0x1915
+CONFIG_USB_DEVICE_PID=0x5300
+CONFIG_USB_CDC_ACM=y
+
+# Decrease memory footprint
+CONFIG_CBPRINTF_NANO=y
+CONFIG_TIMESLICING=n
+CONFIG_BOOT_BANNER=n
+CONFIG_CONSOLE=n
+CONFIG_CONSOLE_HANDLER=n
+CONFIG_UART_CONSOLE=n
+CONFIG_USE_SEGGER_RTT=n
+CONFIG_LOG=n
+CONFIG_ERRNO=n
+CONFIG_PRINTK=n
+CONFIG_RESET_ON_FATAL_ERROR=n
+CONFIG_SPI=n
+CONFIG_I2C=n
+CONFIG_UART_NRFX=n
+
+# The following configurations are required to support simultaneous multi image update
+CONFIG_PCD_APP=y
+CONFIG_UPDATEABLE_IMAGE_NUMBER=2
+CONFIG_BOOT_UPGRADE_ONLY=y
+# The network core cannot access external flash directly. The flash simulator must be used to
+# provide a memory region that is used to forward the new firmware to the network core.
+CONFIG_FLASH_SIMULATOR=y
+CONFIG_FLASH_SIMULATOR_DOUBLE_WRITES=y
+CONFIG_FLASH_SIMULATOR_STATS=n
+
+# Enable custom command to erase settings partition.
+CONFIG_ENABLE_MGMT_PERUSER=y
+CONFIG_BOOT_MGMT_CUSTOM_STORAGE_ERASE=y