spi: dt-bindings: Add num-cs property for mpfs-spi

commit cbcb8cb526d404e7ca897590ae14116c25ab21cc from
https://github.com/linux4microchip/linux.git linux-6.6-mchp+fpga

The PolarFire SoC SPI "hard" controller supports eight CS lines, out of
which only one CS line is physically wired. The default value of
'num-cs' was never set and it did not didn't impose a maximum value.

To reflect this hardware limitation in the device tree, the binding
enforces that the 'num-cs' property cannot exceed 1 unless additional
CS lines are explicitly defined using GPIO descriptors.

Fixes: 2da18730

 ("spi: add bindings for microchip mpfs spi")
Signed-off-by: Prajna Rajendra Kumar <prajna.rajendrakumar@microchip.com>
Signed-off-by: harish h <harish.h@windriver.com>