This is a rare sound. Dahalo has both a palatal lateral fricative and an affricate; Hadza has a series of affricates. In Bura is the realization of palatalized /ɬʲ/ and contrasts with [ʎ].
The IPA has no dedicated symbol for this sound. The devoicing and raising diacritics may be used to transcribe it: 〈ʎ̝̊〉 (decimal ʎ̥˔). However, the "belt" on the existing symbol for a voiceless lateral fricative, 〈ɬ〉, forms the basis for occasional ad hoc symbols for the other lateral fricatives, the third one, 〈〉, representing the palatal lateral fricative: