ArmVirtPkg/FdtPL011SerialPortLib: Set the PL011 UART clock rate

The interface to PL011UartInitializePort has changed in
ArmPlatformPkg/Drivers/PL011Uart with the title:
"ArmPlatformPkg: Add support to configure PL011 UART clock"

This patch updates the calls to PL011UartInitializePort(), in line with
that change, adding a parameter value using the PCD previously used
directly by the driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

ArmVirtPkg/Library/FdtPL011SerialPortLib/FdtPL011SerialPortLib.c

@@ -81,8 +81,14 @@ FdtPL011SerialPortLibInitialize (
   StopBits = (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits);
 
   return PL011UartInitializePort (
-           mSerialBaseAddress, &BaudRate, &ReceiveFifoDepth,
-           &Parity, &DataBits, &StopBits);
+           mSerialBaseAddress,
+           FixedPcdGet32 (PL011UartClkInHz),
+           &BaudRate,
+           &ReceiveFifoDepth,
+           &Parity,
+           &DataBits,
+           &StopBits
+           );
 }
 
 /**