boot/espressif: Add hal subdirectory for IDF sources and headers

Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>
diff --git a/boot/espressif/hal/include/bootloader_wdt.h b/boot/espressif/hal/include/bootloader_wdt.h
new file mode 100644
index 0000000..e5ac551
--- /dev/null
+++ b/boot/espressif/hal/include/bootloader_wdt.h
@@ -0,0 +1,8 @@
+/*
+ * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+void bootloader_wdt_feed(void);