sm8350-common: charger: Enable offline charger suspend

Squashed in this commit:
Author: Yifan Hong <elsk@google.com>
Date:   Mon Jul 15 16:43:26 2019 -0700

    sm8350-common: Replace BOARD_CHARGER_ENABLE_SUSPEND with ro.charger.enable_suspend

    Test: charger mode
    Bug: 124118169
    Change-Id: I3825d08e38d677bd7154879609857de302348b6f

Change-Id: I27a642dbadfba1575ff2d8e96dc385fc19c0eaff

system.prop

@@ -2,6 +2,9 @@
 ro.bluetooth.library_name=libbluetooth_qti.so
 vendor.bluetooth.soc=hastings
 
+# Charger
+ro.charger.enable_suspend=true
+
 # CNE
 persist.vendor.cne.feature=1