Revert "Fix power_off error"

This reverts commit 61e2cb6f91f11d3ee7475f536c1c8ce48f73ba43.
Revert "Update kernel 3.4.40 to 3.4.88"

This reverts commit 8d478e5566dde66bf64e73f800adc739c64d67b8.
Revert "Update kernel 3.4.20 to 3.4.40"

This reverts commit eb40cc7e4d363326ac20ce0248c60e68a0e9054d.