dt-bindings: xilinx: Remove uartlite from xilinx.txt

current-speed description has been added to uartlite description by commit
3de536a8c365 ("dt-bindings: serial: uartlite: Add properties for
synthesis-time parameters") that's why no reason to have in xilinx.txt too.

Fixes: 3de536a8c365 ("dt-bindings: serial: uartlite: Add properties for synthesis-time parameters")
Signed-off-by: Michal Simek <[e-mail]>
Reviewed-by: Sean Anderson <[e-mail]>
Link: https://lore.kernel.org/r/aa0b[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/xilinx.txt

···
       property, and may include other common network device properties
       like local-mac-address.
 
-      iv) Xilinx Uartlite
-
-      Xilinx uartlite devices are simple fixed speed serial ports.
-
-      Required properties:
-       - current-speed : Baud rate of uartlite
-
       v) Xilinx hwicap
 
 		Xilinx hwicap devices provide access to the configuration logic