spi: pxa2xx: Clean up linux/spi/pxa2xx_spi.h

Merge series from Andy Shevchenko <andriy.shevchenko@linux.intel.com>:

A couple of cleanups against linux/spi/pxa2xx_spi.h.

I'm sending this as v3 to land in the SPI subsystem. Meanwhile I'm
preparing an update to make linux/spi/pxa2xx_spi.h private to the
subsystem (PXA2xx driver). But the second part will be presented later
on (likely after v6.9-rc1). That said, this can be routed either via
SoC tree or SPI, up to respective maintainers.

include/linux/spi/pxa2xx_spi.h

@@ -17,7 +17,7 @@ struct dma_chan;
  * (resides in device.platform_data).
  */
 struct pxa2xx_spi_controller {
-	u16 num_chipselect;
+	u8 num_chipselect;
 	u8 enable_dma;
 	u8 dma_burst_size;
 	bool is_target;
@@ -45,12 +45,4 @@ struct pxa2xx_spi_chip {
 	u32 timeout;
 };
 
-#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
-
-#include <linux/clk.h>
-
-extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_controller *info);
-
-#endif
-
 #endif	/* __LINUX_SPI_PXA2XX_SPI_H */