bcm63xx: Allow 'colored' power leds.

Since some devices have more than one power led, they might be separated by
their color in the name. To also allow them to be on after leaving preinit,
set any status led starting with 'power' to on instead of only those with
the exact name of 'power'.

Signed-off-by: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24187 3c298f89-4303-0410-b956-a3cf2f4a3e73