RIL: fix LTE display formatting bug

Signed-off-by: mvglasow <michael -at- vonglasow.com>
RIL: prevent showing a serving LTE cell in GSM list

Signed-off-by: mvglasow <michael -at- vonglasow.com>
RIL: update serving cell ref in onCellInfoChanged()

Signed-off-by: mvglasow <michael -at- vonglasow.com>