Prepare v2018.05-rc1

Prepare v2018.03

Prepare v2018.03-rc4

Prepare v2018.03-rc3

Prepare v2018.03-rc2

Prepare v2018.03-rc1

Prepare v2018.01

Prepare v2018.01-rc3

Revert "Revert "usb: rockchip: add the rockusb gadget""

This reverts commit 7a4b754.

Prepare v2018.01-rc2