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Similar to CE4100, BayTrail LPSS SPI can be PCI enumerated
as well. Thus, the functions are renamed from ce4100_xxx
to pxa2xx_spi_pci_xxx to clarify that this is a generic
PCI glue layer. Also, added required infrastructure to
support SPI hosts with different configurations.

This patch is based on Mika Westerberg's previous work.
Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>