Kernel/USB: Start fleshing out a basic UHCI controller driver :^)

Let's see if we can talk to some USB devices. We will now detect
a UHCI controller if present on the PCI bus.

Kernel/CMakeLists.txt

@@ -33,6 +33,7 @@ set(KERNEL_SOURCES
     Devices/RandomDevice.cpp
     Devices/SB16.cpp
     Devices/SerialDevice.cpp
+    Devices/UHCIController.cpp
     Devices/VMWareBackdoor.cpp
     Devices/ZeroDevice.cpp
     DoubleBuffer.cpp