staging: gdm724x: fix line limit coding style issue in gdm_lte.c

This is a patch to fix "WARNING: line over 80 characters" found by
checkpatch.pl in gdm_lte.c.

Signed-off-by: Ning Zhou <zhou.ning.gd@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>