spi: pxa2xx: Remove unused psp member variable from struct chip_data

It is not used since commit 8d94cc50aa4f ("[PATCH] spi: stabilize PIO mode
transfers on PXA2xx systems").

Signed-off-by: Jarkko Nikula <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-pxa2xx.h

···
 	u32 cr0;
 	u32 cr1;
 	u32 dds_rate;
-	u32 psp;
 	u32 timeout;
 	u8 n_bytes;
 	u32 dma_burst_size;