machines: Drop ast2400/ast2500 layers

The Aspeed layer now supports both chips and the SOC specific layers
do not have any content.  Drop the redundant layers.

Change-Id: I48a813fe4c02b8fc8861c6dd58906ae559c64403
Tested: Built and verified witherspoon and palmetto images
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
1 file changed
tree: f569d131e96387380725e0fd38b356a7fd93c528
  1. conf/
  2. meta-centriq2400-rep/