Do not follow deps for apex_vndk

Since apex_vndk deals with its own dependencies, it should not follow
dependencies while packaging.

Bug: 139772411
Test: TARGET_VNDK_USE_CORE_VARIANT=true m com.android.vndk.current
      see if there are unexpected libs in the apex
      for example, android.hardware.audio.common@2.0.so should not be
      included in the apex since it is not listed as "must use vendor
      variant".

Change-Id: Ibada600b3099fb19630d1e327a2e09cd26b2deb0

apex/apex.go

@@ -1176,7 +1176,7 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 					ctx.PropertyErrorf("apps", "%q is not an android_app module", depName)
 				}
 			}
-		} else {
+		} else if !a.vndkApex {
 			// indirect dependencies
 			if am, ok := child.(android.ApexModule); ok {
 				// We cannot use a switch statement on `depTag` here as the checked