include: env: phytec: k3_net: Use get_cmd

'net_fetch_cmd' is not defined by the K3 board files. They
use the more common 'get_cmd' from NXP products.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>

include/env/phytec/k3_net.env

@@ -10,8 +10,8 @@
 
 netargs=setenv bootargs console=${console} root=/dev/nfs ip=dhcp rw
 	nfsroot=${serverip}:${nfsroot},vers=4,tcp ${optargs}
-netloadimage=${net_fetch_cmd} ${kernel_addr_r} ${serverip}:/Image
-netloadfdt=${net_fetch_cmd} ${fdt_addr_r} ${serverip}:/${fdtfile}
+netloadimage=${get_cmd} ${kernel_addr_r} ${serverip}:/Image
+netloadfdt=${get_cmd} ${fdt_addr_r} ${serverip}:/${fdtfile}
 netboot=run netargs;
 	setenv autoload no;
 	dhcp;