firmware: google: Release devices before unregistering the bus

firmware: google: Release devices before unregistering the bus

[ Upstream commit 99b41724df4607535ceacd3b79a55310a2b2825e ]

Fix a bug where the kernel module can't be loaded after it has been
unloaded as the devices are still present and conflicting with the
to be created coreboot devices.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Link: https://lore.kernel.org/r/20191118101934.22526-2-patrick.rudolph@9elements.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 65946690ed8d ("firmware: coreboot: Register bus in module init")
Signed-off-by: Sasha Levin <sashal@kernel.org>