Initial support for USB, UHCI, and USB Keyboards.

This adds preliminary support for USB controllers and keyboards.
Add support for UHCI controllers.
Add support for "HID" USB keyboards.
Also, fix bug in hexdump() - len need not be power of 4.
diff --git a/Makefile b/Makefile
index a933f60..c4016e8 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,8 @@
 # Source files
 SRCBOTH=output.c util.c block.c floppy.c ata.c misc.c mouse.c kbd.c pci.c \
         serial.c clock.c pic.c cdrom.c ps2port.c smp.c resume.c \
-        pnpbios.c pirtable.c vgahooks.c pmm.c ramdisk.c
+        pnpbios.c pirtable.c vgahooks.c pmm.c ramdisk.c \
+        usb.c usb-uhci.c usb-hid.c
 SRC16=$(SRCBOTH) system.c disk.c apm.c pcibios.c font.c
 SRC32=$(SRCBOTH) post.c shadow.c memmap.c coreboot.c boot.c \
       acpi.c smm.c mptable.c smbios.c pciinit.c optionroms.c mtrr.c \
@@ -136,7 +137,7 @@
 	$(Q)$(LD) -r -T $(OUT) $< -o $@
 $(OUT)rom.o: $(OUT)rom16.o $(OUT)rom32.o $(OUT) $(OUT)
-	@echo "  Linking $@ (version \"$(VERSION)\")"
+	@echo "  Linking $@"
 	$(Q)$(LD) -T $(OUT) $(OUT)rom16.o -R $(OUT)rom32.o -o $(OUT)rom16.reloc.o
 	$(Q)$(STRIP) $(OUT)rom16.reloc.o -o $(OUT)
 	$(Q)$(OBJCOPY) --adjust-vma 0xf0000 $(OUT)rom16.o $(OUT)rom16.moved.o