Turn the charging LED to green only when battery is full

The charging LED was lit green when the charging battery reached
a specific threshold. Because of our own lock-screen battery meter
(see FPIIM-202), we want to align the green color to *fully* charged
only.

FPIIM-290

Change-Id: Id14566313ca0bcb04a71f1e74a40c467d6b1ed08
1 file changed