Support the fallback path with device memories.

CPU fallback with device memories:
1. Allocate BLOB mode AHWBs for input and output device memories.
2. Copy out input device memories by IBuffer::copyTo.
3. Compute on CPU.
4. Copy back output device memories by IBuffer::copyFrom.

Bug: 152208838
Test: NNT_static with a broken driver
Change-Id: I9fed3134a7c56c893ff94e892cc25d230a1bd972
Merged-In: I9fed3134a7c56c893ff94e892cc25d230a1bd972
(cherry picked from commit 7b352ec1d710de550df2719a98083b04ccadfe1a)