ESS-59: do not mess with /etc/rc.local or /etc/modules on installation

This was only required to update older (May 2011) Maverick builds to newer
ones (July 2011) once imx-settings got better at its job, but now it's 2013,
and it is just causing churn on install.

Signed-off-by: Matt Sealey <matt@genesi-usa.com>
version bump to 2.1.2 to include ESS-59 fix.

Signed-off-by: Matt Sealey <matt@genesi-usa.com>