[automerger skipped] Add TENSOR_QUANT8_ASYMM_SIGNED support to ADD, MUL and SUB. am: 53c79d179a am: 761a0807cd
am: 773625f3e6 -s ours
am skip reason: change_id I47ffc2c264390f3c6b98aa9567fb47f2c58333fe with SHA1 122bc2c0cc is in history

Change-Id: I149bb75cb8874015ed13e1cbc935303a77f41490