FreeBSD/src e1d8f44 (r344219)sys/arm/allwinner axp81x.c

Add sysctl for setting battery charging current.
The charging current can be set using steps
from 0: 200mA to 13: 2800mA (200mA/step).
While there, fix battery charging current related
sensor descriptions.

Reviewed by:    manu
Differential Revision:  https://reviews.freebsd.org/D19212
DeltaFile
+43-2sys/arm/allwinner/axp81x.c
+43-21 files

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