audio: add the property audio.offload.min.duration.secs

Add the property audio.offload.min.duration.secs in qssi.mk.

Change-Id: I6dce8da82ef27dc03adc4163f494ccecdf70b0b3
diff --git a/configs/qssi/qssi.mk b/configs/qssi/qssi.mk
index 39569fb..653c177 100644
--- a/configs/qssi/qssi.mk
+++ b/configs/qssi/qssi.mk
@@ -106,6 +106,10 @@
 PRODUCT_PRODUCT_PROPERTIES += \
 audio.sys.noisy.broadcast.delay=600
 
+#offload minimum duration set to 30sec
+PRODUCT_PRODUCT_PROPERTIES += \
+audio.offload.min.duration.secs=30
+
 #offload pausetime out duration to 3 secs to inline with other outputs
 PRODUCT_PRODUCT_PROPERTIES += \
 audio.sys.offload.pstimeout.secs=3