sepolicy: qcom: Allow reading PSU sysfs by system_server

BatteryService queries the usb state to check whether the usb type
is HVDCP. This patch adds a rule to allow that.

For more context check BatteryService#Led#isHvdcpPresent.

Change-Id: Ifacf13dde4b1df81c92bf5d92196e504e61dd402
1 file changed