Avoid using printk_ratelimit() in many places because:
  - many were error messages reporting broken hardware (it's useful to
    get all of these).
  - the message itself wasn't useful so the message has been removed.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

Error path for wusb_set_dev_addr() was handled incorrectly. Fix it by
considering error only when return value is negative.
Signed-off-by: NAnderson Lizardo <anderson.lizardo@indt.org.br>
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

Add the WUSB protocol (MMC management and device connection) code.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>