boot: zephyr: add support for mimxrt1040_evk

Add default configuration for mimxrt1040_evk.

Signed-off-by: Andrej Butok <andrey.butok@nxp.com>
diff --git a/boot/zephyr/boards/mimxrt1040_evk.conf b/boot/zephyr/boards/mimxrt1040_evk.conf
new file mode 100644
index 0000000..35f90d4
--- /dev/null
+++ b/boot/zephyr/boards/mimxrt1040_evk.conf
@@ -0,0 +1,4 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_BOOT_MAX_IMG_SECTORS=1024