m7vzw: update system props (again)

telephony.rilV7NeedCDMALTEPhone is deprecated.

I was overzealous in removing some props that are used by proprietary
libs (run strings on the ril libs). These are being re-included:
persist.radio.add_power_save
persist.radio.snapshot_enabled
persist.radio.snapshot_timer
ro.ril.wp.feature

Change-Id: I9ba02340c26b8c6dcc90574a58326d3d17223474

system.prop

@@ -1,15 +1,20 @@
 # system.prop for m7vzw
 #
 
-# RIL
+# RIL - AOSP properties
 rild.libargs=-d /dev/smd0
 rild.libpath=/system/lib/libril-qc-qmi-1.so
 ril.subscription.types=NV,RUIM
 ro.telephony.default_network=8
 ro.cdma.subscribe_on_ruim_ready=true
 telephony.lteOnCdmaDevice=1
-telephony.rilV7NeedCDMALTEPhone=true
 ro.telephony.ril_class=HTCQualcommM7CDMARIL
+
+# RIL - Proprietary lib properties
+persist.radio.add_power_save=1
+persist.radio.snapshot_enabled=1
+persist.radio.snapshot_timer=22
+ro.ril.wp.feature=1
 ro.use_data_netmgrd=true
 
 # Carrier definitions