gpu: ion: Implement platform device/data for aries and p1

Change-Id: Id63091152d98dd47c7624431a45522c1de117bdb
aries | p1: bring configuration inline with herring

* Enable ion by default.
* Enable sync/sw_sync infrastructure.
* Drop s3c_fb's NR_BUFFERS back to 4.
* Enable S5PV210 ion support.
* Enable SG chaining support.

Change-Id: Ieb5f80f284526a270e391fe6e2ffb4bca2e8a503