espressif: Add warning for unsupported chip revision

Added checking and warning for ESP32, ESP32-S2, ESP32-C3, ESP32-S3
unsupported chip revisions on their initialization.

Made respectively changes for build system and documentation.

Signed-off-by: Almir Okato <almir.okato@espressif.com>
diff --git a/boot/espressif/main.c b/boot/espressif/main.c
index 6fe93a2..6e59b00 100644
--- a/boot/espressif/main.c
+++ b/boot/espressif/main.c
@@ -93,7 +93,9 @@
 
 int main()
 {
-    bootloader_init();
+    if (bootloader_init() != ESP_OK) {
+        FIH_PANIC;
+    }
 
     BOOT_LOG_INF("Enabling RNG early entropy source...");
     bootloader_random_enable();