Remove components that conflict with composite disk support.

This CL makes the following changes for composite disk support:

  (1) Replace pre-composite-disk sepolicy with by-name symlinks.

  (2) Do not explicity name the super partition "vda". This causes
      conflicts with code that expects a retrofit device.

  (3) Remove sepolicy that configures the super partition as a retrofit
      device.

Bug: 141516138
Test: atest VendorOverlayHostTest
Change-Id: I44e83b132453d94d3663b9493995f23357a6967e
4 files changed