apps/system USB Functional Partitioning

[patacongo]

Several of the USB device helper applications in apps/system violate OS/application partitioning and will fail on a kernel or protected build. Many of these have been fixed by adding the BOARDIOC_USBDEV_CONTROL boardctl() command. But there are still issues.

These functions still call directly into operating system functions:

• usbmsc_configure - Called from apps/system/usbmsc and apps/system/composite
• usbmsc_bindlun - Called from apps/system/usbmsc
• usbmsc_exportluns - Called from apps/system/usbmsc.