x86: config: Enable USB on link

Enable USB support on link - there are two EHCI ports available.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/chromebook_link.h

@@ -50,8 +50,6 @@
 #undef CONFIG_SPI
 #undef CONFIG_CMD_SPI
 #undef CONFIG_CMD_SF
-#undef CONFIG_USB_EHCI
-#undef CONFIG_CMD_USB
 
 #define CONFIG_PCI_MEM_BUS	0xe0000000
 #define CONFIG_PCI_MEM_PHYS	CONFIG_PCI_MEM_BUS