Revert "Kconfig: cmd: Make networking command dependent on NET"

This reverts the parts of commit 3b3ea2c56ec4bc5588281fd103c744e608f8b25c
where it changed the EFI dependency on NET.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

Reviewed-by: Duncan Hare <dh@synoia.com>
diff --git a/Kconfig b/Kconfig
index 0b73006..081be6c 100644
--- a/Kconfig
+++ b/Kconfig
@@ -71,7 +71,7 @@
 	select CMD_BOOTI if ARM64
 	select CMD_DHCP if CMD_NET
 	select CMD_PING if CMD_NET
-	select CMD_PXE if NET && CMD_NET
+	select CMD_PXE if NET
 	select CMD_EXT2
 	select CMD_EXT4
 	select CMD_FAT