[PATCH] power_supply: Hold a wake_lock while power supply
 change notifications are pending
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When connecting usb or the charger the device would often go back to sleep
before the charge led and screen turned on.

Change-Id: I01def6d86ddece0d4e31d2a91d176ed0975b6b9d
Signed-off-by: Arve Hjønnevåg <arve@android.com>