drivers: xilinx_spi: Probe fifo_depth at runtime

If the fifo-size DT parameter is not provided then probe the
controller's fifo depth at runtime. This is ported from a patch
in the Linux Xilinx SPI driver.

Signed-off-by: Mayuresh Chitale <[email protected]>
Reviewed-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Love Kumar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

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