Kernel/Devices: Remove SerialDevice::initialize method

We can just do the initialization sequence in the constructor.

Kernel/Devices/SerialDevice.cpp

@@ -16,7 +16,11 @@ SerialDevice::SerialDevice(NonnullOwnPtr<IOWindow> registers_io_window, unsigned
  : CharacterDevice(4, minor)
  , m_registers_io_window(move(registers_io_window))
 {
- initialize();
+ set_interrupts(false);
+ set_baud(Baud38400);
+ set_line_control(None, One, EightBits);
+ set_fifo_control(EnableFIFO | ClearReceiveFIFO | ClearTransmitFIFO | TriggerLevel4);
+ set_modem_control(RequestToSend | DataTerminalReady);
 }
 
 SerialDevice::~SerialDevice() = default;
@@ -76,15 +80,6 @@ void SerialDevice::put_char(char ch)
  m_last_put_char_was_carriage_return = (ch == '\r');
 }
 
-void SerialDevice::initialize()
-{
- set_interrupts(false);
- set_baud(Baud38400);
- set_line_control(None, One, EightBits);
- set_fifo_control(EnableFIFO | ClearReceiveFIFO | ClearTransmitFIFO | TriggerLevel4);
- set_modem_control(RequestToSend | DataTerminalReady);
-}
-
 void SerialDevice::set_interrupts(bool interrupt_enable)
 {
  m_interrupt_enable = interrupt_enable;