ANDROID: GKI: USB: XHCI: add Android ABI padding to struct xhci_driver_overrides

Given that the vendors like to hook the xhci platform driver to handle
offload functionality that is not yet upstream, add some more padding to
struct xhci_driver_overrides in order to be able to handle any future
problems easier.

Bug: 151154716
Bug: 182336717
Cc: Daehwan Jung <dh10.jung@samsung.com>
Cc: JaeHun Jung <jh0801.jung@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iaa59f63b0777c7671292bd0839a6eb8f57bc7a59