net: gem: Fix typo in Kconfig entry

Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NJoe Hershberger <joe.hershberger@ni.com>

drivers/net/Kconfig

@@ -105,6 +105,6 @@ config ZYNQ_GEM
 	depends on DM_ETH && (ARCH_ZYNQ || ARCH_ZYNQMP)
 	bool "Xilinx Ethernet GEM"
 	help
-	  This MAC is presetn in Xilinx Zynq and ZynqMP SoCs.
+	  This MAC is present in Xilinx Zynq and ZynqMP SoCs.
 
 endif # NETDEVICES