Bug#544264: module won't be built in 2.6.31-2

[Wouter Lueks <wouter@telox.net>]

Dear Bastian,

When testing the package I discovered the module pmu_battery is not yet
being build. After a bit of thinkering I figured out that
CONFIG_POWER_SUPPLY should be enabled as well, since CONFIG_BATTERY_PMU
depends on it.

I build debian kernel 2.6.31-2 after adding this option and this time
the module is built, and I can confirm that battery information is
available trough sysfs now.

N.B. The official package is still building (although the logs indicate
its finished), so nothing is in the official repo yet.

Kind regards,
Wouter