Fix MAC addresses on Kitkat

.nvmac* files require permissions to be set in order for framework
to read them correctly.

Change-Id: I6429e6045849bf9deae5a04c357094d7c8c9d86c
Improve formatting of BoardConfig

Change-Id: I0133733e8a3f1ac4cda05607ff2e23d30c0d47d2