spi: pxa2xx: Prepare for new Intel LPSS SPI type

Some of the Intel LPSS SPI properties will be different in upcoming
platforms compared to existing Lynxpoint and BayTrail/Braswell. LPSS SPI
private registers will be at different offset and there will be changes in
individual registers and default FIFO thresholds too.

Add configuration for these differences and use them in runtime based on
LPSS SSP type. With this change private registers offset autodetection
becomes needless.

Signed-off-by: Jarkko Nikula <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

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