[dbus] Allow everybody to make battery data method calls. Fixes JB#37492
[dbus] Allow everybody to make battery data method calls. Fixes JB#37492

The methods are supposed to be callable by anybody, but D-Bus configuration
allowing that was forgotten and thus the methods can be used only by root
processes.

Allow also unprivileged user processes to send the battery data method
call messages to mce.

Signed-off-by: Simo Piiroinen <6d5e5360bed3d486f7d9fb26b0f737f7d4fd45ee@jollamobile.com>

spiiroin/mce,spiiroin/mce,spiiroin/mce,spiiroin/mce