mt6735 通话过程中连接BT再切换成听筒，上行音量变小

[DESCRIPTION]
1.不连接BT通话，此时的上行音量为vol1
2.通话过程中连接BT，然后切换成听筒模式，此时的上行音量为vol2
3.vol2明显小于vol1
[SOLUTION]
直接修改如下函数或者申请pathALPS01427017
status_t SpeechDriverLAD::SetSpeechMode(const audio_devices_t input_device, const audio_devices_t
output_device)
{
speech_mode_t speech_mode = GetSpeechModeByOutputDevice(output_device);
ALOGD("%s(), input_device = 0x%x, output_device = 0x%x, speech_mode = %d", __FUNCTION__, input_device,
output_device, speech_mode);
// AP side have to set speech mode before speech/record/loopback on,
// hence we check whether Modem side get all necessary speech enhancement parameters here
// if not, re-send it ！
if (pCCCI->CheckSpeechParamAckAllArrival() == false) {
ALOGW("%s(), Do SetAllSpeechEnhancementInfoToModem() done. Start set speech_mode = %d", __FUNCTION__,
speech_mode);
}
// set a unreasonable gain value s.t. the reasonable gain can be set to modem next time
mDownlinkGain = kUnreasonableGainValue;
mUplinkGain = kUnreasonableGainValue;
mSideToneGain = kUnreasonableGainValue;
status_t ret = pCCCI->SendMessageInQueue(pCCCI->InitCcciMailbox(MSG_A2M_SET_SPH_MODE, speech_mode, 0));
pCCCI->SetModEMSideRealModemStatus(SPEECH_MODE_STATUS_MASK);
return ret;
}

小编原来还是音频专家啊！