Revert "staging: android: lowmemorykiller: Change default debug_level to 1"

This reverts commit cffa1c258efa1b5831cf4df23ddc048b2abd7caa.
Revert "staging: android: lowmemorykiller: well-marked debug print"

This reverts commit 1c27a79aaa18c2f8e419fbf338a0523574102ed1.