rp-pppoe:3.8->3.11

-deleted use-ldflags.patch that not needed.
-modified patches for 3.11

Signed-off-by: Lei Maohui <leimaohui@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>