MAINTAINERS: add fragment for xilinx GPIO drivers

Added entry for xilinx GPIO drivers.

Signed-off-by: Srinivas Neeli <[e-mail]>
Acked-by: Shubhrajyoti Datta <[e-mail]>
Acked-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/net/can/xilinx_can.txt
 F:	drivers/net/can/xilinx_can.c
 
+XILINX GPIO DRIVER
+M:	Shubhrajyoti Datta <[e-mail]>
+R:	Srinivas Neeli <[e-mail]>
+R:	Michal Simek <[e-mail]>
+S:	Maintained
+F:	Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
+F:	Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+F:	drivers/gpio/gpio-xilinx.c
+F:	drivers/gpio/gpio-zynq.c
+
 XILINX SD-FEC IP CORES
 M:	Derek Kiernan <[e-mail]>
 M:	Dragan Cvetic <[e-mail]>