move old audio-HAL code under legacy

Change-Id: Ic70f5ed9690a80801865a60c807657e51a476be6
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/legacy/Android.mk b/legacy/Android.mk
new file mode 100644
index 0000000..356b7de
--- /dev/null
+++ b/legacy/Android.mk
@@ -0,0 +1,6 @@
+ifneq ($(filter msm8960,$(TARGET_BOARD_PLATFORM)),)
+
+AUDIO_ROOT := $(call my-dir)
+include $(call all-subdir-makefiles)
+
+endif