Add dummy implemention of Tizen specific elm_config magnification

Add dummy implemention of Tizen specific elm_config magnification

The Tizen elementary tree contains a magnification feature that for
some reason has not been pushed into upstream EFL.  Attempting to just
cherry pick the implementation into an up to date elementay tree will
require some additional porting effort since the codebase has evolved
so much since the Tizen tree was branched.  This change just adds dummy
implementations for each of the external methods so that the unmodified
tizen pre-installed applications run before the port is available.