power: align wakeup_sources format

This aligns every column of elements in wakeup_sources to
conveniently check any specific column for suspicious power
consumption wakeup source or for other easily human readable purpose.

Change-Id: I69137fc4af272f392f3e0c1a4bd48d5a5dee7d2c
Signed-off-by: yangdongdong <yangdongdong@xiaomi.com>