prov/psm: remove an extra return statement

The line was introduced during EQ separation, when the MR to EQ
binding was temporarily disabled.

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
prov/psm: remove some obsolete comments

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
prov/psm: remove conditional compilation for AM-based funcitons

The provider only supports a very limited set of api if AM is
disabled. In practice we always want to have access to the extra
api funcitons enbaled by the AM support.

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>