Kernel: Add very simple BGA driver

Only thing this is currently helpful is qemu when booting with -kernel
flag as that does not provide framebuffer info in multiboot headers

kernel/CMakeLists.txt

@@ -41,6 +41,7 @@ set(KERNEL_SOURCES
 	kernel/FS/USTARModule.cpp
 	kernel/FS/VirtualFileSystem.cpp
 	kernel/GDT.cpp
+	kernel/Graphics/BGA.cpp
 	kernel/IDT.cpp
 	kernel/Input/InputDevice.cpp
 	kernel/Input/PS2/Controller.cpp