apex.use_vndk_as_stable can't be used with min_sdk_version

For vendor apexes, use_vndk_as_stable: true means the apex is tied with
the current VNDK version while min_sdk_version: N means the apex should
work with N+ VNDK versions. Setting both properties together doesn't
make sense.

Bug: 274396342
Test: m nothing (soong tests)
Change-Id: I00dcac43f95ce6a90b3f3273ae4611a300ea5028
diff --git a/apex/apex_test.go b/apex/apex_test.go
index e1e508b..c9665a4 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -7880,7 +7880,6 @@
 			name: "myapex",
 			key: "myapex.key",
 			updatable: true,
-			min_sdk_version: "current",
 			use_vndk_as_stable: true,
 			soc_specific: true,
 		}
@@ -7893,6 +7892,25 @@
 	`)
 }
 
+func Test_use_vndk_as_stable_shouldnt_be_used_with_min_sdk_version(t *testing.T) {
+	testApexError(t, `"myapex" .*: use_vndk_as_stable: not supported when min_sdk_version is set`, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			updatable: false,
+			min_sdk_version: "29",
+			use_vndk_as_stable: true,
+			vendor: true,
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+	`)
+}
+
 func Test_use_vndk_as_stable_shouldnt_be_used_for_non_vendor_apexes(t *testing.T) {
 	testApexError(t, `"myapex" .*: use_vndk_as_stable: not supported for system/system_ext APEXes`, `
 		apex {