Modify type of some environmental reverb parameters

Changed type of decay time, reverb delay and reflections delay parameters
from signed to unsigned int to match OpenSL ES interface definition.

Also fixed some type casts in lvm reverb wrapper.

Change-Id: I5ca5e76a87c2590f01f031f3168355586ef22556
diff --git a/include/media/EffectEnvironmentalReverbApi.h b/include/media/EffectEnvironmentalReverbApi.h
index 2233e3f..36accd8 100644
--- a/include/media/EffectEnvironmentalReverbApi.h
+++ b/include/media/EffectEnvironmentalReverbApi.h
@@ -48,16 +48,16 @@
 
 //t_reverb_settings is equal to SLEnvironmentalReverbSettings defined in OpenSL ES specification.
 typedef struct s_reverb_settings {
-    int16_t roomLevel;
-    int16_t roomHFLevel;
-    int32_t decayTime;
-    int16_t decayHFRatio;
-    int16_t reflectionsLevel;
-    int32_t reflectionsDelay;
-    int16_t reverbLevel;
-    int32_t reverbDelay;
-    int16_t diffusion;
-    int16_t density;
+    int16_t     roomLevel;
+    int16_t     roomHFLevel;
+    uint32_t    decayTime;
+    int16_t     decayHFRatio;
+    int16_t     reflectionsLevel;
+    uint32_t    reflectionsDelay;
+    int16_t     reverbLevel;
+    uint32_t    reverbDelay;
+    int16_t     diffusion;
+    int16_t     density;
 } __attribute__((packed)) t_reverb_settings;