plugins/wdc: Add type case for feature id

plugins/wdc: Add type case for feature id

clang reports

../plugins/wdc/wdc-nvme.c:9000:36: warning: implicit conversion from enumeration type 'NVME_FEATURE_IDENTIFIERS' (aka 'enum _NVME_FEATURE_IDENTIFIERS') to different enumeration type 'enum nvme_features_id' [-Wenum-conversion]
                                             deFeatureIdList[listIdx].featureId,
                                             ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

Add type case to avoid the warning. Ideally, the plugin would not
introduce their own enum value.

Signed-off-by: Daniel Wagner <dwagner@suse.de>