make the boot animation 32-bits to avoid banding

Bug: 6611693

Change-Id: Id31b711ea755c89240eaea26f6403a031cd939e4
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 1d5f207..225be9c 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -160,7 +160,7 @@
     codec->setDitherImage(false);
     if (codec) {
         codec->decode(&stream, &bitmap,
-                SkBitmap::kRGB_565_Config,
+                SkBitmap::kARGB_8888_Config,
                 SkImageDecoder::kDecodePixels_Mode);
         delete codec;
     }