[SB][Battery] Enable battery shield icon for all device types.

Bug: 345378052
Flag: EXEMPT bugfix
Test: `adb shell am broadcast -a com.android.systemui.demo -e command
battery -e defender true` on a phone -> shows shield
Test: atest BatteryMeterViewControllerTest BatteryMeterViewTest

Change-Id: Id16bb43b1ae3f71e5ccc3faaa95b5b55a073a369