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/bindings/espressif,esp32-spi.yaml

@@ -12,27 +12,32 @@ properties:
       The SPI host (controller) to use.
       Defined by spi_host_device_t (e.g. SPI2_HOST, SPI3_HOST).
   pin-sclk:
-    type: phandle-array
+    type: phandles
     default: GPIO_PIN_SPEC_NONE
   pin-mosi:
-    type: phandle-array
+    type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: MOSI (Data 0) pin
   pin-miso:
-    type: phandle-array
+    type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: MISO (Data 1) pin
   pin-wp:
-    type: phandle-array
+    type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: WP (Data 2) pin
   pin-hd:
-    type: phandle-array
+    type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: HD (Data 3) pin
   max-transfer-size:
     type: int
     default: 0
     description: |
-      Data transfer size limit in bytes. 
+      Data transfer size limit in bytes.
       0 means the platform decides the limit.
+  cs-gpios:
+    type: phandle-array
+    element-type: "struct GpioPinSpec"
+    default: "{ }"
+    description: Null-terminated array of chip select GPIO pin specs for peripherals on this bus