Revert "charger: Display battery percentage on the charging screen"

This reverts commit b830e6217a2e70c4d37e676c4ad0bb9f25fe6939.

Change-Id: Ifd07d5653bfbf3afc5ff320776a1ff9b6fd57aac
Merge "Revert "charger: Display battery percentage on the charging screen"" into kk4.4