Reverts r293369. The macro was orginally correct, since our SMBus
framework, unlike i2c, already requires addresses to be 8-bit, LSB-cleared.
MFC after: 3 days
Sponsored by: Juniper Networks, Inc
ismt(4) supports the SMBus Message Transport controller found on Intel
C2000 series (Avoton) and S1200 series (Briarwood) Atom SoCs.
Sponsored by: Intel