Partially Revert "mondrianwifi: wcnss: Allow wcnss to override the MAC address"

That commit added support for user-space to store a MAC address
(which we still need) and my attempt to change the wlan driver
to use it.  CAF has a better commit for the later and I am going
to use it instead.

Change-Id: I03b6dabaf7653d8e2b3e256bf583bd104ed75aa2
wlan: Get Mac addr from platform driver

commit 8fbcda1d88de3bb7fdefb7f77a7bd59e61cb9eec
Author: Hardik Kantilal Patel <hkpatel@codeaurora.org>
Date:   Tue Dec 17 20:53:54 2013 +0530

    wlan: Get Mac addr from platform driver

    Read the MAC address from the platform driver preferrably and
    fall back to the option of auto generating the same, if the
    MAC read is invalid.

    Change-Id: I8a7529bdf7f0d146a2c128a697ebe8c7c374f40a
    CRs-Fixed: 583465

Change-Id: I5008a03f3646b44ceefc38d416857ba9103fe998