New kernel drivers and device implementation updates (#561)

- Added modular device support and devicetree bindings for ILI9341, ILI9488, CST816S, XPT2046, and GPIO button input, updating several board configurations for display/touch/backlight/keyboard/battery.
- Added a setting to control deprecated HAL usage (device property + Kconfig).

Drivers/cst816s-module/include/bindings/cst816s.h

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <drivers/cst816s.h>
+
+DEFINE_DEVICETREE(cst816s, struct Cst816sConfig)

Drivers/cst816s-module/include/cst816s_module.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/module.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct Module cst816s_module;
+
+#ifdef __cplusplus
+}
+#endif

Drivers/cst816s-module/include/drivers/cst816s.h

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <tactility/drivers/gpio.h>
+
+struct Cst816sConfig {
+    // Devicetree address hint. Unused by the driver: the CST816S always sits at a fixed
+    // I2C address (0x15, see ESP_LCD_TOUCH_IO_I2C_CST816S_ADDRESS), unlike GT911's
+    // strapping-dependent address.
+    uint8_t address;
+    uint16_t x_max;
+    uint16_t y_max;
+    bool swap_xy;
+    bool mirror_x;
+    bool mirror_y;
+    struct GpioPinSpec pin_reset;
+    struct GpioPinSpec pin_interrupt;
+    bool reset_active_high;
+    bool interrupt_active_high;
+};
+
+#ifdef __cplusplus
+}
+#endif