boot: zephyr: esp32: zephyr port

Add support for ESP32xx targets to build
as Zephyr application.

Signed-off-by: Marek Matej <marek.matej@espressif.com>
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index 1493dc3..c7e2e99 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -628,6 +628,7 @@
 	default y if BOOT_SERIAL_CDC_ACM #usb driver requires MULTITHREADING
 	default y if BOOT_USB_DFU_GPIO || BOOT_USB_DFU_WAIT
 	default n if SOC_FAMILY_NRF
+	default n if SOC_FAMILY_ESP32 && MCUBOOT
 	default y
 
 config LOG_PROCESS_THREAD