Add drivers to module and make start/stop optional (#580)

Devices/m5stack-stickc-plus2/source/module.cpp

@@ -7,7 +7,7 @@ constexpr auto* TAG = "StickCPlus2";
 
 extern "C" {
 
-static bool init_power() {
+static error_t init_power() {
     // CH552 applies 4 V to GPIO 0, which reduces Wi-Fi sensitivity.
     // Setting output to high adds a bias of 3.3 V and suppresses over-voltage:
     gpio_set_direction(GPIO_NUM_0, GPIO_MODE_OUTPUT);
@@ -17,25 +17,12 @@ static bool init_power() {
     gpio_set_direction(GPIO_NUM_4, GPIO_MODE_OUTPUT);
     gpio_set_level(GPIO_NUM_4, 1);
 
-    return true;
-}
-
-static error_t start() {
-    init_power();
-    return ERROR_NONE;
-}
-
-static error_t stop() {
-    // Empty for now
     return ERROR_NONE;
 }
 
 Module m5stack_stickc_plus2_module = {
     .name = "m5stack-stickc-plus2",
-    .start = start,
-    .stop = stop,
-    .symbols = nullptr,
-    .internal = nullptr
+    .start = init_power
 };
 
 }