APEXes contain VNDK libraries when VNDK is deprecated

Currently vendor APEX can link to VNDK when 'use_vndk_as_stable'
property is set as true. However, when VNDK is deprecated, all former
VNDK libraries should be included in the vendor APEX despite of property
value. This change ignores use_vndk_as_stable when VNDK is set as
deprecated.

Bug: 290318998
Test: aosp_cf_x86_64_phone with WITH_VNDK=false build checked that
Vendor APEX contains all required VNDK libraries within the APEX

Change-Id: I648277d734274e7852b3effc24e7780e55089f75

apex/apex_test.go

@@ -3029,7 +3029,11 @@ func TestVendorApex_use_vndk_as_stable(t *testing.T) {
 			vendor: true,
 			shared_libs: ["libvndk", "libvendor"],
 		}
-	`)
+	`,
+		android.FixtureModifyConfig(func(config android.Config) {
+			config.TestProductVariables.KeepVndk = proptools.BoolPtr(true)
+		}),
+	)
 
 	vendorVariant := "android_vendor.29_arm64_armv8-a"