Consolidate defaults for hostside network tests apps.

For now, only share a couple of statements (min_sdk_version and
platform_apis). More will be added later.

Also, remove the test_suites stanzas everywhere. These are not
relevant for test apps because the APKs will be pulled in by
the data: stanzas anyway.

Bug: 365191921
Test: atest CtsHostsideNetworkTests
Change-Id: If510519b3bdd6ab27c1923bae523cddb694e0ecc
diff --git a/tests/cts/hostside/Android.bp b/tests/cts/hostside/Android.bp
index 14d5d54..0f87dc2 100644
--- a/tests/cts/hostside/Android.bp
+++ b/tests/cts/hostside/Android.bp
@@ -23,6 +23,12 @@
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+java_defaults {
+    name: "CtsHostsideNetworkTestsAllAppDefaults",
+    platform_apis: true,
+    min_sdk_version: "30",
+}
+
 java_test_host {
     name: "CtsHostsideNetworkTests",
     defaults: ["cts_defaults"],