Add a bus_notifier for platform bus device in order to map the device
mmio regions when DOM0 booting with ACPI.
Signed-off-by: NShannon Zhao <shannon.zhao@linaro.org>
Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: NJulien Grall <julien.grall@arm.com>