rewrite Get BT Capabilities using new provider API
rewrite Get BT Capabilities using new provider API

Modify to use the new provider API. One by one, change calls to
remove any legacy API constructs.

Tested-by: ipmitool raw 6 0x36
 01 3f 3f 0a 01

Change-Id: I9be3d21c041ba1d99f6672c4501faafcca117d11
Signed-off-by: Vernon Mauery <4fbc0e9805d36da7c621cd4d73f3eb0d5b12b5f3@linux.intel.com>

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid