staging: android: Remove ion device tree bindings from the TODO

Commit 23a4388f ("staging: android: ion: Remove file ion_chunk_heap.c")
and eadbf7a3 ("staging: android: ion: Remove file ion_carveout_heap.c")
removed the chunk and carveout heaps from ion but left behind the device
tree bindings for them in the TODO, this patch removes it.

Signed-off-by: Donald Yandt <donald.yandt@gmail.com>
Link: https://lore.kernel.org/r/20190818152023.891-1-donald.yandt@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>