spi: xilinx: Fix kernel documentation in the xilinx_spi.h

While updating the data structure layout the kernel documentation
became outdated. Synchronize kernel documentation with the actual
data structure layout.

Fixes: 1dd46599 ("spi: xilinx: add force_irq for QSPI mode")
Fixes: 082339bc ("spi: spi-xilinx: Add run run-time endian detection")
Reviewed-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240308162920.46816-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/spi/xilinx_spi.h

@@ -5,10 +5,10 @@
 /**
  * struct xspi_platform_data - Platform data of the Xilinx SPI driver
  * @num_chipselect:	Number of chip select by the IP.
- * @little_endian:	If registers should be accessed little endian or not.
  * @bits_per_word:	Number of bits per word.
  * @devices:		Devices to add when the driver is probed.
  * @num_devices:	Number of devices in the devices array.
+ * @force_irq:		If set, forces QSPI transaction requirements.
  */
 struct xspi_platform_data {
 	u16 num_chipselect;