Patch from Pavel Machek

It seems that sharp had charger on by default... This at least turns
it off. Also battery reading now works and is useful.
Signed-off-by: NPavel Machek <pavel@suse.cz>
Acked-by: NRichard Purdie <rpurdie@rpsys.net>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>