Add charger related property contexts

ro.enable_boot_charger_mode and sys.boot_from_charger_mode are moved to
new property contexts for charger props to remove exported*_prop.

Bug: 155844385
Test: boot device with ro.enable_boot_charger_mode
Change-Id: I17d195d3c9c002a42125d46a5efcdb890f1c2a5c
diff --git a/private/compat/27.0/27.0.ignore.cil b/private/compat/27.0/27.0.ignore.cil
index a42538f..d17b5bd 100644
--- a/private/compat/27.0/27.0.ignore.cil
+++ b/private/compat/27.0/27.0.ignore.cil
@@ -37,7 +37,9 @@
     build_vendor_prop
     camera_config_prop
     cgroup_bpf
+    charger_config_prop
     charger_exec
+    charger_status_prop
     color_display_service
     content_capture_service
     crossprofileapps_service