net: Rework dependencies around NET/NET_LWIP and NETDEVICES

Functionally, both networking stacks require DM_ETH. This is because
they both also require some networking devices to be enabled. Express
this more correctly by having both NET and NET_LWIP select NETDEVICES.
In turn NETDEVICES no longer depends on NET or NET_LWIP as it's not
prompted anymore.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jerome Forissier <jerome.forissier@arm.com>

Kconfig

@@ -804,14 +804,14 @@ config NO_NET
 
 config NET
 	bool "Legacy U-Boot networking stack"
-	imply NETDEVICES
+	select NETDEVICES
 	help
 	  Include networking support with U-Boot's internal implementation of
 	  the TCP/IP protocol stack.
 
 config NET_LWIP
 	bool "Use lwIP for networking stack"
-	imply NETDEVICES
+	select NETDEVICES
 	help
 	  Include networking support based on the lwIP (lightweight IP)
 	  TCP/IP stack (https://nongnu.org/lwip). This is a replacement for

drivers/net/Kconfig

@@ -90,9 +90,10 @@ config DSA_SANDBOX
 	  Ethernet device used as DSA master, to test DSA class code, including
 	  exported DSA API and datapath processing of Ethernet traffic.
 
-menuconfig NETDEVICES
-	bool "Network device support"
-	depends on NET || NET_LWIP
+menu "Network device support"
+
+config NETDEVICES
+	bool
 	select DM_ETH
 	help
 	  You must select Y to enable any network device support
@@ -1106,3 +1107,5 @@ source "drivers/net/pfe_eth/Kconfig"
 source "drivers/net/fsl-mc/Kconfig"
 
 endif # NETDEVICES
+
+endmenu