Kconfig: cmd: Make networking command dependent on NET

Enable networking command only when NET is enabled.
And remove selecting NET for CMD_NET

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_pdu001_defconfig b/configs/am335x_pdu001_defconfig
index c6bffe0..58d7676 100644
--- a/configs/am335x_pdu001_defconfig
+++ b/configs/am335x_pdu001_defconfig
@@ -28,13 +28,12 @@
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
-# CONFIG_CMD_NET is not set
-# CONFIG_CMD_NFS is not set
 CONFIG_CMD_PMIC=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_EMBED=y
+# CONFIG_NET is not set
 CONFIG_SPL_DM=y
 CONFIG_DM_GPIO=y
 CONFIG_DM_I2C=y