Use bswap_16 instead of swap16, because swap16 is not available in glibc

#include <media/stagefright/MediaDebug.h>

#include <media/stagefright/Utils.h>

#include <utils/String8.h>

#include <sys/endian.h>

#include <byteswap.h>

namespace android {

            // endianness marker doesn't match host endianness, convert

            framedatacopy = new char16_t[len];

            for (int i = 0; i < len; i++) {

                framedatacopy[i] = swap16(framedata[i]);

                framedatacopy[i] = bswap_16(framedata[i]);

            }

            framedata = framedatacopy;

        }