bootloader: API for the fast wakeup and custom using RTC mem

Added "Reserve RTC FAST memory for custom purposes" option.
Added a boot counter.

components/bootloader/subproject/main/bootloader_start.c

@@ -41,6 +41,14 @@ void __attribute__((noreturn)) call_start_cpu0(void)
         bootloader_reset();
     }
 
+#ifdef CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
+    // If this boot is a wake up from the deep sleep then go to the short way,
+    // try to load the application which worked before deep sleep.
+    // It skips a lot of checks due to it was done before (while first boot).
+    bootloader_utility_load_boot_image_from_deep_sleep();
+    // If it is not successful try to load an application as usual.
+#endif
+
     // 2. Select the number of boot partition
     bootloader_state_t bs = { 0 };
     int boot_index = select_partition_number(&bs);