msm: 8974: Add ION to device tree

Add ION heaps to the device tree for 8974 target and remove
ION heap definitions from 8974 board file.

Change-Id: I13075c6223f0e88027ee5547b759e0ee01f1769a
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
3 files changed