If present a file called .settings will be sourced when
calling the arm_sdimage.sh script. This allows to configure
the build setting for arm build without the need to specify
the flags each time arm_sdimage.sh is called.
For example to configure arm_sdimage.sh to target the
beaglebone put the following content in your .settings file.
BASE_URL=http://www.minix3.org/arm/beaglebone
FLAG=-DAM335X
CONSOLE=tty00
Change-Id: Ide0341a255bc7f41dc5c30d0a43e71b01a8ea55c
eb1e5bf042