spi: support for intel_mid_ssp_spi for tangier simulation

spi: support for intel_mid_ssp_spi for tangier simulation

BZ: 25983

The tangier simulator has some quirks that need to be accounted for:
Broken interrupt status handling
Broken PCI config space setting

Change-Id: Ifc02b2ae0d1db9bc2c9d65eb6a37ca49416bcf85
Signed-off-by: Mark F. Brown <mark.f.brown@intel.com>
Reviewed-on: http://android.intel.com:8080/37361
Reviewed-by: Ng, Cheon-woei <cheon-woei.ng@intel.com>
Tested-by: Ng, Cheon-woei <cheon-woei.ng@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>