ksp5012: libs_pwr: defer battery control to BATTERY_LIBS

If CONFIG_BATTERY_LIBS is enabled, use it to manage and
control the battery operation.

Additional cleanup (mostly kfree additions).

Signed-off-by: Russell Robinson <rrobinson@phytec.com>
Revert "comment out libs_pwr polling PIC voltage"

This reverts commit 636cf2a3f350172a26c0dd6d9bd866d1e50ad586.
Merge remote-tracking branch 'rdrjr-phytect/WIP/rrobinson@phytec.com/4AJ.2.5P2' into dev