Deprecate rp-pppoe, functionality is in pppd

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/rp-pppoe/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_RP_PPPOE
 	bool "pppoe"
+	depends on BR2_DEPRECATED
 	help
 	  An implementation of the Point-to-point protocol over Ethernet.