cephfs: fix make go-lint error

Not sure why but go-lint is failing
with below error and this fix is required
to make it pass

```
directive `//nolint:staticcheck // See comment above.`
is unused for linter "staticcheck" (nolintlint)
```

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

internal/cephfs/util/mountinfo.go

@@ -24,7 +24,7 @@ import (
 
 	"github.com/container-storage-interface/spec/lib/go/csi"
 	// google.golang.org/protobuf/encoding doesn't offer MessageV2().
-	"github.com/golang/protobuf/proto" //nolint:staticcheck // See comment above.
+	"github.com/golang/protobuf/proto" //nolint:all // See comment above.
 	"google.golang.org/protobuf/encoding/protojson"
 )