CHROMIUM: config: enable r8152 driver

This change enabling r8152 net usb driver.

BUG=chrome-os-partner:33342
TEST=ethernet usb dongle which is using r8152 solution can be detected
on kitty with factory kernel.

Change-Id: I93f4dc9c4378dc13e40847df4aa2b58dc51741df
Signed-off-by: Ken Chang <kenc@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/234938
Tested-by: Titan Lee <titanlee@nvidia.com>
Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Commit-Queue: Titan Lee <titanlee@nvidia.com>