USB: enclose USB_XHCI_HCD related symbols within a if USB_XHCI_HCD block
USB: enclose USB_XHCI_HCD related symbols within a if USB_XHCI_HCD block

This patch encloses all symbols depending on USB_XHCI_HCD within an if
USB_XHCI_HCD / endif block.

Acked-by: Alan Stern <75ea6bb7bfc1186f92d26164de5f9268c9a45b59@rowland.harvard.edu>
Signed-off-by: Florian Fainelli <73262ad0334ab37227b2f7a0205f51db1e606681@openwrt.org>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas