Set min_sdk_version 29 for SL compat library build

Bug: 170290085
Test: m neuralnetworks_sample_sl_driver
Change-Id: Ia8ed8c2cec00caf9422a572c6943432b25ba0b75
diff --git a/common/Android.bp b/common/Android.bp
index 574f471..9defa49 100644
--- a/common/Android.bp
+++ b/common/Android.bp
@@ -258,6 +258,7 @@
     vendor_available: false,
     stl: "libc++_static",
     sdk_version: "current",
+    min_sdk_version: "29",
     cflags: [
         "-DNN_COMPATIBILITY_LIBRARY_BUILD",
         "-DNN_NO_BURST",