fate: atrac: Place atrac1 and atrac3 tests in different groups

tests/fate/atrac.mak

-FATE_ATRAC += fate-atrac1
+FATE_ATRAC1 += fate-atrac1
 fate-atrac1: CMD = pcm -i $(SAMPLES)/atrac1/test_tones_small.aea
 fate-atrac1: REF = $(SAMPLES)/atrac1/test_tones_small.pcm
 
-FATE_ATRAC += fate-atrac3-1
+FATE_ATRAC3 += fate-atrac3-1
 fate-atrac3-1: CMD = pcm -i $(SAMPLES)/atrac3/mc_sich_at3_066_small.wav
 fate-atrac3-1: REF = $(SAMPLES)/atrac3/mc_sich_at3_066_small.pcm
 
-FATE_ATRAC += fate-atrac3-2
+FATE_ATRAC3 += fate-atrac3-2
 fate-atrac3-2: CMD = pcm -i $(SAMPLES)/atrac3/mc_sich_at3_105_small.wav
 fate-atrac3-2: REF = $(SAMPLES)/atrac3/mc_sich_at3_105_small.pcm
 
-FATE_ATRAC += fate-atrac3-3
+FATE_ATRAC3 += fate-atrac3-3
 fate-atrac3-3: CMD = pcm -i $(SAMPLES)/atrac3/mc_sich_at3_132_small.wav
 fate-atrac3-3: REF = $(SAMPLES)/atrac3/mc_sich_at3_132_small.pcm
 
-$(FATE_ATRAC): CMP = oneoff
+FATE_ATRAC_ALL = $(FATE_ATRAC1) $(FATE_ATRAC3)
 
-FATE_SAMPLES_AVCONV += $(FATE_ATRAC)
-fate-atrac: $(FATE_ATRAC)
+$(FATE_ATRAC_ALL): CMP = oneoff
+
+FATE_SAMPLES_AVCONV += $(FATE_ATRAC_ALL)
+
+fate-atrac:  $(FATE_ATRAC_ALL)
+fate-atrac3: $(FATE_ATRAC3)