[automerger skipped] Update kernel to builds 5639638 am: d8e9923821
am: 1f14a680ed -s ours
am skip reason: change_id Ic3c1f7e72338932c994e0c7af2c584cbc9bc0d79 with SHA1 bfa9f56178 is in history

Change-Id: Ib20c46c1e73c9e086e2443e76c57dc53557a1154