ANDROID: GKI: pci: add Android ABI padding to some structures

Try to mitigate potential future driver core api changes by adding a
padding to struct pci_sriov, struct pci_dev, struct pci_bus, and struct
pci_driver.

Based on a change made to the RHEL/CENTOS 8 kernel.

Bug: 151154716
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I236df60165b25a33b06fc81f76014162401ba742