occ_manager: add missing PLDM check

The configuration POWER10 does not explicitly depend on PLDM, but there
were a few calls to the pldmHandle outside a PLDM guard.  Add the PLDM
guards in.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I1ae1a6a6ade375acc7ba4e59ddf0d8e0c5b7a711
1 file changed