Revert "PM: domains: Restore comment indentation for generic_pm_domain.child_links"

This reverts commit e4e88f74.

It breaks the Android kernel abi, so revert it.  If it needs to come
back later, it can do so in an abi-safe way.

Bug: 161946584
Change-Id: I71929e88391b3dc0ee871f406ae05dd8abb30ab0
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>