ArmVirtualizationPkg: PlatformIntelBdsLib: detect consoles dynamically

ArmVirtualizationPkg: PlatformIntelBdsLib: detect consoles dynamically

Detect the video displays dynamically, and add them to the console and
error output variables.

Add a short-form, "wild card" USB_CLASS_DEVICE_PATH to the console input
variable, which causes the USB keyboard to be handled automatically.

Add the fixed location serial console to all of the console input, console
output, and error output variables.

This patch enables QEMU users to drop "addr=..." PCI address
specifications from the -device options (or to use whatever addresses they
like). For example, the following works:

  -device VGA \
  \
  -device ich9-usb-ehci1,multifunction=on,id=ehci \
  -device ich9-usb-uhci1,multifunction=on,masterbus=ehci.0,firstport=0 \
  -device ich9-usb-uhci2,multifunction=on,masterbus=ehci.0,firstport=2 \
  -device ich9-usb-uhci3,multifunction=on,masterbus=ehci.0,firstport=4 \
  -device usb-kbd,bus=ehci.0

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16924 6f19259b-4bc3-4df7-8a09-765794883524