Kernel: Increase PS2 timeout to 300 ms, load PS2 in separate thread

PS/2 seems to hit command timeout sometimes on slow emulation so
increase the timeouts.

Also move PS/2 device initialization to a different thread because
device indentification waits for timeouts.

kernel/include/kernel/Input/PS2/Controller.h

@@ -27,7 +27,9 @@ namespace Kernel::Input
 	private:
 		PS2Controller() = default;
 		BAN::ErrorOr<void> initialize_impl(uint8_t scancode_set);
-		BAN::ErrorOr<void> initialize_device(uint8_t, uint8_t scancode_set);
+		BAN::ErrorOr<void> identify_device(uint8_t, uint8_t scancode_set);
+
+		void device_initialize_task(void*);
 
 		BAN::ErrorOr<uint8_t> read_byte();
 		BAN::ErrorOr<void> send_byte(uint16_t port, uint8_t byte);

kernel/include/kernel/Input/PS2/Device.h

@@ -22,6 +22,7 @@ namespace Kernel::Input
 
 	protected:
 		PS2Device(PS2Controller&, InputDevice::Type type);
+		virtual ~PS2Device();
 
 	protected:
 		PS2Controller& m_controller;