AudioService: fix voice volume adjustments

Even if the device does not support TelephonyManager (mPlatformType is not PLATFORM_VOICE), the app may still choose stream_voice_call to play sound. At this time, it is also necessary to determine whether stream_voice_call is active.

Change-Id: I88a925605e20e1fbc65974836a0f585b0e00bbcc
Signed-off-by: chenxin20 <chenxin20@xiaomi.com>