Generate product variants by default

PRODUCT_PRODUCT_VNDK_VERSION is set to 'current' by default. Now, we
can generate product variants without checking the
PRODUCT_PRODUCT_VNDK_VERSION build variable. Remove reading the
PRODUCT_PRODUCT_VNDK_VERSION variable from soong and generate product
variants by default.

Bug: 302255959
Test: m
Change-Id: I9a9b2076f4367c5ce9a393bbb206f8dee3884bd8
diff --git a/apex/vndk_test.go b/apex/vndk_test.go
index 2b86e53..e2aee96 100644
--- a/apex/vndk_test.go
+++ b/apex/vndk_test.go
@@ -115,12 +115,7 @@
 	})
 
 	t.Run("VNDK APEX gathers only vendor variants even if product variants are available", func(t *testing.T) {
-		ctx := testApex(t, bp,
-			android.FixtureModifyProductVariables(func(variables android.FixtureProductVariables) {
-				// Now product variant is available
-				variables.ProductVndkVersion = proptools.StringPtr("current")
-			}),
-		)
+		ctx := testApex(t, bp)
 
 		files := getFiles(t, ctx, "com.android.vndk.current", "android_common")
 		ensureFileSrc(t, files, "lib/libfoo.so", "libfoo/android_vendor.29_arm_armv7-a-neon_shared/libfoo.so")