build: change custom -> omni in a few more places

* these weren't changed when the transtition occured - fix them now

Change-Id: I47bedb96ad63a41959baa98e1a265cb616d17918

Conflicts:
	envsetup.sh

 Author:    Lalit Maganti <lalitmaganti@gmail.com>
 Changes to be committed:
	modified:   envsetup.sh