pinctrl: zynqmp: Add pinctrl driver

Add pinctrl driver for Xilinx ZynqMP SOC. This driver is compatible with
linux device tree parameters for configuring pinmux and pinconf.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/2d7eefa83c8c0129f7243a25de56a289e948f6c6.1645626183.git.michal.simek@xilinx.com
diff --git a/MAINTAINERS b/MAINTAINERS
index 4e740fb..915316a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -620,6 +620,7 @@
 F:	drivers/net/phy/ethernet_id.c
 F:	drivers/net/phy/xilinx_phy.c
 F:	drivers/net/zynq_gem.c
+F:	drivers/pinctrl/pinctrl-zynqmp.c
 F:	drivers/serial/serial_zynq.c
 F:	drivers/spi/zynq_qspi.c
 F:	drivers/spi/zynq_spi.c