Galaxys2-common: clean up warnings during init

Fix properties during init. ro.model to ro.product.model, ro.manufacturer to
ro.product.manufacturer for USB, to avoid errors during init. Use {}-syntax to
avoid the deprecation warnings during init. This fixes the device name when
connecting to a PC.

Removed duplicate definition of multicast dns. This is already in init.rc.
Duplicate definition is ignored anyway.

Change-Id: I1afab4e9d9184727599614c12674125589118a1f