Remove fat, usb_host, USB_10, USB_11 in build_travis.py --> alignment with other targets after rebase

Author: bcostm

tools/build_travis.py

@@ -237,7 +237,7 @@
      "toolchains": "GCC_ARM",
      "tests": {""     : ["MBED_2", "MBED_10", "MBED_11", "MBED_16"],
                "rtos" : ["RTOS_1", "RTOS_2", "RTOS_3"],
-               "usb"  : ["USB_1", "USB_2" ,"USB_3", "USB_10", "USB_11"],
+               "usb"  : ["USB_1", "USB_2" ,"USB_3"],
                }
      },
     {"target": "DISCO_L476VG",