include: env: phytec: k3_net: Remove net_apply_extensions

Extensions are now handled by the board-code. Remove this non-existing
function to proper boot from network.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
diff --git a/include/env/phytec/k3_net.env b/include/env/phytec/k3_net.env
index 8ad1cb7..2ccdc9e 100644
--- a/include/env/phytec/k3_net.env
+++ b/include/env/phytec/k3_net.env
@@ -18,5 +18,4 @@
 	run netloadimage;
 	run netloadfdt;
 	run net_apply_overlays;
-	run net_apply_extensions;
 	booti ${kernel_addr_r} - ${fdt_addr_r}