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/esp32_i2c.cpp

@@ -238,7 +238,8 @@ static constexpr I2cControllerApi ESP32_I2C_API = {
     .write = write,
     .write_read = write_read,
     .read_register = read_register,
-    .write_register = write_register
+    .write_register = write_register,
+    .probe = nullptr
 };
 
 extern Module platform_esp32_module;