docs/source.android.com: convert LOCAL_MODULE_PATH to LOCAL_MODULE_RELATIVE_PATH

LOCAL_MODULE_PATH doesn't work for multiarch builds, replace it
with LOCAL_MODULE_RELATIVE_PATH.

Change-Id: I4e4ceec61d026bbe74ba604554c06104bde42e5e
diff --git a/src/devices/audio_implement.jd b/src/devices/audio_implement.jd
index a4e6b7f..9267d9e 100644
--- a/src/devices/audio_implement.jd
+++ b/src/devices/audio_implement.jd
@@ -137,7 +137,7 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := audio.primary.tuna
-LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_MODULE_RELATIVE_PATH := hw
 LOCAL_SRC_FILES := audio_hw.c ril_interface.c
 LOCAL_C_INCLUDES += \
         external/tinyalsa/include \