can: Add firmware flashing support

Modifications are required to support new ioctls
and send them using messages over spi.

CRs-Fixed: 1025945
Change-Id: Ibc41a1f0a8a7d0bd929209069869ae65fba75c70
Signed-off-by: Alex Yakavenka <ayakav@codeaurora.org>
Signed-off-by: Bruce Wu <brucewu@codeaurora.org>