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)

Devices/unphone/unphone.dts

@@ -5,6 +5,9 @@
 #include <tactility/bindings/esp32_gpio.h>
 #include <tactility/bindings/esp32_i2c.h>
 #include <tactility/bindings/esp32_spi.h>
+#include <tactility/bindings/esp32_sdspi.h>
+#include <tactility/bindings/display_placeholder.h>
+#include <tactility/bindings/touch_placeholder.h>
 
 / {
 	compatible = "root";
@@ -30,9 +33,25 @@
 	sdcard_spi: spi0 {
 		compatible = "espressif,esp32-spi";
 		host = <SPI2_HOST>;
+		cs-gpios = <&gpio0 48 GPIO_FLAG_NONE>, // Display
+		           <&gpio0 38 GPIO_FLAG_NONE>, // Touch
+		           <&gpio0 43 GPIO_FLAG_NONE>; // SD card
 		pin-mosi = <&gpio0 40 GPIO_FLAG_NONE>;
 		pin-miso = <&gpio0 41 GPIO_FLAG_NONE>;
 		pin-sclk = <&gpio0 39 GPIO_FLAG_NONE>;
 		max-transfer-size = <65536>;
+
+		display@0 {
+			compatible = "display-placeholder";
+		};
+
+		touch@1 {
+			compatible = "touch-placeholder";
+		};
+
+		sdcard@2 {
+			compatible = "espressif,esp32-sdspi";
+			frequency-khz = <20000>;
+		};
 	};
 };