m7spr: update ril system props

From 5.03.651.3 build.prop:
- Increase snapshot_timer to 22
- Remove ril props that do not exist in stock and don't seem to belong
  * While persist.radio.mode_pref_nv10 does exist when running strings
    on m7spr radio libs, it isn't specified in build.prop.
- Add QCOM prop "ro.ril.scan.selection.rat"
  * This does exist when running strings on m7spr radio libs

Change-Id: I7562310cea0040140b9e61c68a759fc6a042ec80

system.prop

@@ -4,10 +4,10 @@
 rild.libargs=-d /dev/smd0
 rild.libpath=/system/lib/libril-qc-qmi-1.so
 persist.radio.snapshot_enabled=1
-persist.radio.snapshot_timer=2
+persist.radio.snapshot_timer=22
 ro.telephony.default_network=10
 telephony.lteOnCdmaDevice=1
-persist.radio.apm_sim_not_pwdn=1
+
 ro.cdma.home.operator.numeric=310120
 ro.cdma.home.operator.alpha=Sprint
 gsm.sim.operator.alpha=Sprint
@@ -16,6 +16,5 @@ gsm.sim.operator.iso-country=us
 gsm.operator.alpha=Sprint
 gsm.operator.numeric=310120
 gsm.operator.iso-country=us
-persist.radio.use_nv_for_ehrpd=true
-persist.radio.mode_pref_nv10=1
-persist.radio.always_send_plmn=true
+
+ro.ril.scan.selection.rat=1