Power subsystem improvements and bug fixes (#353)

* BT: render icon statically.
* Move API HAL Power init call to api_hal_init.
* API HAL Power: replace stop2 mode with stop1 to ensure usb and lptim2 proper work.

firmware/targets/f5/api-hal/api-hal.c

@@ -5,5 +5,6 @@ void api_hal_init() {
     api_hal_vcp_init();
     api_hal_spi_init();
     api_hal_i2c_init();
+    api_hal_power_init();
     api_hal_light_init();
 }