Use LOG_ALWAYS_FATAL instead of LOG_FATAL

LOG_FATAL is compiled out in most builds, so the
assertion checks were not being performed.

Change-Id: I774f0985ab9c5ccecd8989a0f1c940386b73fc35
diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 3ac5da9..a1783fe 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -449,7 +449,7 @@
             }
             } break;
         default:
-            LOG_FATAL("bad param");
+            LOG_ALWAYS_FATAL("setParameter track: bad param %d", param);
         }
         break;
 
@@ -474,7 +474,7 @@
             invalidateState(1 << name);
             break;
         default:
-            LOG_FATAL("bad param");
+            LOG_ALWAYS_FATAL("setParameter resample: bad param %d", param);
         }
         break;
 
@@ -522,12 +522,12 @@
             }
             break;
         default:
-            LOG_FATAL("bad param");
+            LOG_ALWAYS_FATAL("setParameter volume: bad param %d", param);
         }
         break;
 
     default:
-        LOG_FATAL("bad target");
+        LOG_ALWAYS_FATAL("setParameter: bad target %d", target);
     }
 }