dpdk: use whole vmbus address as hash key for devconf

dpdk: use whole vmbus address as hash key for devconf

u32[0] is not enough unique for some platforms like azure
where several devices(not only network) can have almost
the same addresses and this can cause collisions.

Change hash to mhash type for vmbus devices with key
of whole 16 bytes of vmbus address.

Type: improvement

Signed-off-by: Vladimir Ratnikov <vratnikov@netgate.com>
Change-Id: Ic6c6a657ae29f45beddd0c69d8e785e702349460