CHROMIUM: net: r8152: Add support of IOCTL

Add support of IOCTL for Realtek's PG tool which is used for
MAC address programming in factory image.

BUG=chrome-os-partner:34691
TEST=MAC address programmed successfully on kitty.

Change-Id: Ief7ed0f9fa0a4be7d51e9d6e5dd340f3991a7518
Signed-off-by: Ken Chang <kenc@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/236852
Reviewed-by: Hayes Wang <hayeswang@realtek.com>
Tested-by: Hayes Wang <hayeswang@realtek.com>
Tested-by: Titan Lee <titanlee@nvidia.com>
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>