PCI: pci-bridge-emul: Fix big-endian support

PCI: pci-bridge-emul: Fix big-endian support

commit c6a366aa0ca167e99a3968e86029897c75a2f2e4 upstream.

Perform conversion to little-endian before every write to configuration
space and convert it back to CPU endianness on reads.

Additionally, initialise every multiple byte field of config space with
the cpu_to_le* macro, which is required since the structure describing
config space of emulated bridge assumes little-endian convention.

Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>