K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2016-10-13T07:25:18.425530Z
K 7
svn:log
V 826
convert iicsmb to use iicbus_transfer for all operations

Previously the driver used more low level operations like iicbus_start
and iicbus_write.  The problem is that those operations are not
implemented by iicbus(4) and the calls were effectively routed to
a driver to which the bus is attached.
But not all of the controllers implement such low level operations
while all of the drivers are expected to have iicbus_transfer.

While there fix incorrect implementation of iicsmb_bwrite and iicsmb_bread.
The former should send a byte count before the actual bytes, while the
latter should first receive the byte count and then receive the bytes.

I have tested only these commands:
- quick (r/w)
- send byte
- receive byte
- read byte
- write byte

MFC after:	1 month
Differential Revision: https://reviews.freebsd.org/D8170

END