Driver improvements (#535)

- New drivers:
  - SD SPI
  - spi_peripheral
  - touch_placeholder
  - display_placeholder
- Devicetree compiler:
  - Implement phandle-arrays
  - Implement device addresses
- Add placeholder drivers to all devices with a SPI display
- SPI driver: add `cs-pins` and set them to high on driver start
- FileSystem: add `file_system_set_owner()` and `file_system_get_owner()`
- File locking is now checking if the related `FileSystem` is part of a shared SPI bus
- Add `device_get_child_count()`
- SDMMC driver: Remove default of `slot` value
- Fix for Crowpanel Basic 3.5" display (add delay to booting)
- Fix for LilyGO T-HMI SD card mounting (delayed mounting by disabling it initially in the dts)

Platforms/platform-esp32/source/drivers/bluetooth/esp32_ble.cpp

@@ -1000,7 +1000,7 @@ const BluetoothApi nimble_bluetooth_api = {
 
 static void create_child_device(struct Device* parent, const char* name,
                                 Driver* drv, struct Device*& out) {
-    out = new Device { .name = name, .config = nullptr, .parent = nullptr, .internal = nullptr };
+    out = new Device { .address = 0, .name = name, .config = nullptr, .parent = nullptr, .internal = nullptr };
     device_construct(out);
     device_set_parent(out, parent);
     device_set_driver(out, drv);