defconfig: msm: Enable RTL8152 adapter drivers for bengal

Enable config for Realtek RTL8152/RTL8153 based USB Ethernet
Adapters for bengal target. This is to align with android
base config.

Change-Id: Ia6698245896f47cebc03924e4398f055393371bb
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>