Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vp8/common/arm/neon/dequantizeb_neon.c

+/*
+ *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <arm_neon.h>
+
+#include "vp8/common/blockd.h"
+
+void vp8_dequantize_b_neon(BLOCKD *d, short *DQC) {
+    int16x8x2_t qQ, qDQC, qDQ;
+
+    qQ   = vld2q_s16(d->qcoeff);
+    qDQC = vld2q_s16(DQC);
+
+    qDQ.val[0] = vmulq_s16(qQ.val[0], qDQC.val[0]);
+    qDQ.val[1] = vmulq_s16(qQ.val[1], qDQC.val[1]);
+
+    vst2q_s16(d->dqcoeff, qDQ);
+}