Revert "PCI: Fix reference leak in pci_register_host_bridge()"

This reverts commit f4db1b2c which is
commit 804443c1 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I18c96df70cedc9b867e026eb6adcdb18dfa24fa1
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>