celox-common: move to 4.3-style fstab in msm8660-common

Change-Id: Ie40f87f6a713b103d0fdeed6dcdf60e3eb617410
celox: consolidate overlays from skyrocket/hercules

  * move common overlays from skyrocket/hercules into celox

Change-Id: Ibf291955106593986b87b8ab703ea72c979f21d7