net: Move CONFIG_RTL8139 to Kconfig

Introduce CONFIG_RTL8139 in Kconfig and move over boards' defconfig
to use that.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
[trini: Fixup MPC8641HPCN* and r2dplus configs]
Signed-off-by: Tom Rini <trini@konsulko.com>
10 files changed