implement littlefs for stm32 (#5987)

Co-authored-by: GUVWAF <78759985+GUVWAF@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Daniel Peter Chokola <dan.chokola@gmail.com>
Co-authored-by: Mark Trevor Birss <markbirss@gmail.com>
Co-authored-by: Austin <vidplace7@gmail.com>

src/shutdown.h

@@ -32,6 +32,8 @@ void powerCommandsCheck()
             delete screen;
         LOG_DEBUG("final reboot!");
         reboot();
+#elif defined(ARCH_STM32WL)
+        HAL_NVIC_SystemReset();
 #else
         rebootAtMsec = -1;
         LOG_WARN("FIXME implement reboot for this platform. Note that some settings require a restart to be applied");