net: netcp: Fix a typo in keystone-netcp.txt

This patch fix a spelling typo in keystone-netcp.txt
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/keystone-netcp.txt

@@ -2,7 +2,7 @@ This document describes the device tree bindings associated with the
 keystone network coprocessor(NetCP) driver support.
 
 The network coprocessor (NetCP) is a hardware accelerator that processes
-Ethernet packets. NetCP has a gigabit Ethernet (GbE) subsytem with a ethernet
+Ethernet packets. NetCP has a gigabit Ethernet (GbE) subsystem with a ethernet
 switch sub-module to send and receive packets. NetCP also includes a packet
 accelerator (PA) module to perform packet classification operations such as
 header matching, and packet modification operations such as checksum