C2SoftMpeg2Dec : Enable KEEP_THREADS_ACTIVE

Bug: 343793479
Test: atest MctsMediaV2TestCases
      atest MctsMediaDecoderTestCases
      atest MctsMediaCodecTestCases
      atest VtsHalMediaC2V1_0TargetVideoDecTest

Change-Id: I11eb3079281acb6a73ea9562b3e138373d9f8ebb
diff --git a/media/codec2/components/mpeg2/Android.bp b/media/codec2/components/mpeg2/Android.bp
index e644ee3..ed711ee 100644
--- a/media/codec2/components/mpeg2/Android.bp
+++ b/media/codec2/components/mpeg2/Android.bp
@@ -14,11 +14,10 @@
         "libcodec2_soft_sanitize_signed-defaults",
     ],
 
-    cflags: [
-        "-DKEEP_THREADS_ACTIVE=0",
-    ],
-
     srcs: ["C2SoftMpeg2Dec.cpp"],
 
-    static_libs: ["libmpeg2dec"],
+    static_libs: [
+        "libmpeg2dec",
+        "android.media.swcodec.flags-aconfig-cc",
+    ],
 }