beckham: Add aov_ec_mixer_paths for MotSpeakerHelper

* Based on observing these in logs...
  - E audio_route: Failed to open /vendor/etc/aov_ec_mixer_paths.xml:
      No such file or directory
  - I MotSpeakerHelper: AOV_EC mixer_path xml not found

Change-Id: Iba85d6b192ab408345785b28bbcd434ec72cae1c

audio/aov_ec_mixer_paths.xml

+<?xml version="1.0" encoding="ISO-8859-1"?>
+<mixer>
+	<!-- These are the initial mixer settings -->
+	<!-- AOV default EC REF settings -->
+	<ctl name="ISRC2INT3 Input 1" value="None" />
+	<ctl name="ISRC1DEC4 Input 1" value="None" />
+	<ctl name="DSP2 Aux 6" value="None" />
+	<!-- AOV default EC REF settings end -->
+
+	<path name="aov-ec-ref-spkr">
+		<ctl name="ISRC2INT3 Input 1" value="SLIMRX1" />
+		<ctl name="ISRC1DEC4 Input 1" value="ISRC2INT3" />
+		<ctl name="DSP2 Aux 6" value="ISRC1DEC4" />
+	</path>
+</mixer>

device.mk

@@ -35,6 +35,7 @@ PRODUCT_AAPT_PREBUILT_DPI := xxxhdpi xxhdpi xhdpi hdpi
 PREBUILT_AUDIOHAL := true
 
 PRODUCT_COPY_FILES += \
+    $(LOCAL_PATH)/audio/aov_ec_mixer_paths.xml:$(TARGET_COPY_OUT_VENDOR)/etc/aov_ec_mixer_paths.xml \
     $(LOCAL_PATH)/audio/audio_effects.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_effects.xml \
     $(LOCAL_PATH)/audio/audio_policy_configuration.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_policy_configuration.xml \
     $(LOCAL_PATH)/audio/audio_platform_info.xml:$(TARGET_COPY_OUT_VENDOR)/etc/audio_platform_info.xml \