hal: Dynamically load the correct path for HUAWEI_SOUND_PARAM_PATH

Rather than specify a single hard-coded path, use the sysfs interface
that Huawei exports to correctly identify the product-identifier for
the device and dynamically compute the correct path for the sound_param_path.

Change-Id: I8a0f771c2ecca553ea4a550f0fee75fdbfed4a71