samsung-gt58: Fix deviceinfo property name for lte variant

Due to the fact that wifi variants have different modem configuration (modem on non-lte deviecs is ignored for now but that may change) the lte kernel name should be called "modem-lte" and not just "modem". The deviceinfo proerty was overlooked when converting gt58lte to generic gt58 port. This makes it impossible to install LTE enabled kernel.

I have overlooked this in all the refactoring for !2431 (merged)