linux-imx

power: supply: sysfs: Use enum to specify property

Power supply property is in fact enum, so reflect it in code.
Also use switch statement in show property function as is done
for storing property.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>