CONFIG_PXA_SSP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_PXA_SSP (not configurable)

modulename: ssp.ko

configname: CONFIG_PXA_SSP

Linux Kernel Configuration
└─>PXA_SSP
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable support for PXA2xx SSP ports

source code:
depends
CONFIG_ARCH_PXA

is depended by
CONFIG_SPI_PXA2XX