Allow vendor-init-settable and public-readable to ro.config.low_ram

ro.config.low_ram should be set on Android Go devices by SoC vendors,
and the value can be read by vendor components.

Bug: 76132948
Bug: 75987246
Test: succeeded building and tested with taimen
Change-Id: I6ac98fa58cf641da4565d6277898fc5e5e6ceca1

public/property_contexts

@@ -209,6 +209,7 @@ ro.boot.fake_battery u:object_r:exported_default_prop:s0 exact int
 ro.boot.hardware.revision u:object_r:exported_default_prop:s0 exact string
 ro.boot.slot_suffix u:object_r:exported_default_prop:s0 exact string
 ro.carrier u:object_r:exported_default_prop:s0 exact string
+ro.config.low_ram u:object_r:exported_config_prop:s0 exact bool
 ro.config.vc_call_vol_steps u:object_r:exported_config_prop:s0 exact int
 ro.frp.pst u:object_r:exported_default_prop:s0 exact string
 ro.hardware.activity_recognition u:object_r:exported_default_prop:s0 exact string