gui/math: Set min_sdk_version

Modules contributing mainline modules (APK/APEX) should set
min_sdk_version as well as apex_available.

For now setting min_sdk_version doesn't change build outputs.
But build-time checks will be added soon.

Exempt-From-Owner-Approval: cherry-pick from internal

Bug: 152655956
Test: m
Merged-In: Ib7685f5f4f924ac145eb4f10ad83a6c0548b2206
Change-Id: Ib7685f5f4f924ac145eb4f10ad83a6c0548b2206
(cherry picked from commit 54042e0ae4a5ea5e78733e7e6c4a9575a86c1415)
diff --git a/libs/math/Android.bp b/libs/math/Android.bp
index 693bace..3b1edcb 100644
--- a/libs/math/Android.bp
+++ b/libs/math/Android.bp
@@ -16,6 +16,14 @@
     name: "libmath",
     host_supported: true,
     vendor_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.media",
+        "com.android.media.swcodec",
+        "com.android.neuralnetworks",
+    ],
+    min_sdk_version: "29",
+
     export_include_dirs: ["include"],
 }