power.stats: Rename column header for rail energy

lshal debug output was not clear that rail energy is cumulative total
since boot. Renaming the column header to clarify this.

Bug: 124080758
Test: adb shell "lshal debug android.hardware.power.stats@1.0::IPowerStats/default"
Change-Id: Ib7cff1e9bd9241eb2bbd73b4a5bc1604883a4178
1 file changed