Add kernel drivers for SPI and UART and make locking APIs more consistent (#489)

- Add kernel support for SPI driver
- Add kernel support for UART driver
- Implemented ESP32 UART kernel driver
- Update existing UART-related code in Tactility to use new kernel driver
- Remove UART from tt::hal::Configuration
- Remove tt_hal_uart functionality but keep functions for now
- Update devicetrees for UART changes
- Kernel mutex and recursive mutex: improved locking API design
- Other kernel improvements
- Added device_exists_of_type() and device_find_by_name()

Devices/m5stack-cores3/m5stack,cores3.dts

@@ -4,6 +4,7 @@
 #include <tactility/bindings/esp32_gpio.h>
 #include <tactility/bindings/esp32_i2c.h>
 #include <tactility/bindings/esp32_i2s.h>
+#include <tactility/bindings/esp32_uart.h>
 
 // Reference: https://docs.m5stack.com/en/core/CoreS3
 / {
@@ -68,4 +69,13 @@
 		pin-data-in = <14>;
 		pin-mclk = <0>;
 	};
+
+	uart_port_a: uart1 {
+		compatible = "espressif,esp32-uart";
+		port = <UART_NUM_1>;
+		pin-tx = <1>;
+		pin-rx = <2>;
+		pin-cts = <GPIO_PIN_NONE>;
+		pin-rts = <GPIO_PIN_NONE>;
+	};
 };