Revert "Merge "net: stmmac: Support for MAC addr from config ini""

This reverts commit 37e7a537, reversing
changes made to 88c251ac.

Change-Id: Ic9394dc75639303b67e8e677cfece3edfc17466e
Acked-by: Abhishek Chauhan <abchauha@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>