spi: pxa2xx: Replace header inclusions by forward declarations

When the data structure is only referred by pointer, compiler may not need
to see the contents of the data type. Thus, we may replace header inclusions
by respective forward declarations. Due to above add missed headers as well.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210423182441.50272-5-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx-dma.c

@@ -9,11 +9,11 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
-#include <linux/pxa2xx_ssp.h>
 #include <linux/scatterlist.h>
 #include <linux/sizes.h>
-#include <linux/spi/spi.h>
+
 #include <linux/spi/pxa2xx_spi.h>
+#include <linux/spi/spi.h>
 
 #include "spi-pxa2xx.h"
 

drivers/spi/spi-pxa2xx-pci.c

@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+
 #include <linux/spi/pxa2xx_spi.h>
 
 #include <linux/dmaengine.h>

drivers/spi/spi-pxa2xx.c

@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/dmaengine.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/gpio/consumer.h>
@@ -25,6 +26,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+
 #include <linux/spi/pxa2xx_spi.h>
 #include <linux/spi/spi.h>
 

drivers/spi/spi-pxa2xx.h

@@ -7,16 +7,18 @@
 #ifndef SPI_PXA2XX_H
 #define SPI_PXA2XX_H
 
-#include <linux/atomic.h>
-#include <linux/dmaengine.h>
-#include <linux/errno.h>
-#include <linux/io.h>
 #include <linux/interrupt.h>
-#include <linux/pxa2xx_ssp.h>
-#include <linux/scatterlist.h>
+#include <linux/io.h>
+#include <linux/types.h>
 #include <linux/sizes.h>
-#include <linux/spi/spi.h>
-#include <linux/spi/pxa2xx_spi.h>
+
+#include <linux/pxa2xx_ssp.h>
+
+struct gpio_desc;
+struct pxa2xx_spi_controller;
+struct spi_controller;
+struct spi_device;
+struct spi_transfer;
 
 struct driver_data {
 	/* SSP Info */

include/linux/spi/pxa2xx_spi.h

@@ -5,6 +5,8 @@
 #ifndef __linux_pxa2xx_spi_h
 #define __linux_pxa2xx_spi_h
 
+#include <linux/types.h>
+
 #include <linux/pxa2xx_ssp.h>
 
 #define PXA2XX_CS_ASSERT (0x01)