Build charger and stop using a prebuilt charge_only_mode

Change-Id: I6ceb60445a67405922f5cee378153553eca948de
rootdir: Fix CTS insecure character device

Change-Id: I0c14c10e27c74a11522047df5309a04c5268522a
Enable selinux enforcing

Change-Id: I41174ce568f87661cbabbe502b066fc3392cd11b
Build charge_only_mode instead of charger

Change-Id: I2e9bb9cc041e01f83531d9d1bb4e986cfb5e7d1b