defconfig: Lahaina: update external display module config

Enable the external display module for both production and debug
level builds. This module is a utility to manage display interface
and audio codec interactions associated with the cable connect
and disconnect events of the display interfaces.

Change-Id: If4458132955f56aa3809c3fc11d72b3f5fde1a32
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>