MAINTAINERS: Add support for Xilinx versal watchdog

Added entry for Xilinx versal watchdog driver.

Signed-off-by: Srinivas Neeli <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

MAINTAINERS

···
 R:	Shubhrajyoti Datta <[e-mail]>
 R:	Michal Simek <[e-mail]>
 S:	Maintained
+F:	Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
 F:	Documentation/devicetree/bindings/watchdog/xlnx,xps-timebase-wdt.yaml
 F:	drivers/watchdog/of_xilinx_wdt.c
+F:	drivers/watchdog/xilinx_wwdt.c
 
 XILINX XDMA DRIVER
 M:	Lizhi Hou <[e-mail]>