This configures the NR mode to "SA Preferred" upon each boot (a setting
that persists even after a factory reset), which is desirable in most
cases. The mode can be customized using ro.vendor.radio.auto_nr_mode:
0: NSA Preferred
1: NSA Only
2: SA Only
3: SA Preferred
Change-Id: I86ad739167a51af04c041887a93462bf5bb5e32f
