Set min_sdk_version

codecs_g711dec is missing min_sdk_version while it is available to
com.android.media.swcodec (which targets Q)

Likewise, libmedia_datasource_headers is set min_sdk_version as well
because it is used by com.android.media.

Bug: 152655956
Test: m
Change-Id: I93b90792f1650de898ff6a5687984b599329411f
diff --git a/media/codecs/g711/decoder/Android.bp b/media/codecs/g711/decoder/Android.bp
index 377833f..efff60b 100644
--- a/media/codecs/g711/decoder/Android.bp
+++ b/media/codecs/g711/decoder/Android.bp
@@ -36,6 +36,7 @@
         cfi: true,
     },
     apex_available: ["com.android.media.swcodec"],
+    min_sdk_version: "29",
 
     target: {
         darwin: {