ART: Clean up android_dlopen_ext() call.

Remove the unnecessary ANDROID_DLEXT_FORCE_FIXED_VADDR flag.
We do not produce oat files with non-zero minimum `p_vaddr`.

Test: Pixel 2 XL boots.
Test: m test-art-host-gtest
Change-Id: I892eb10798f3c72544d100a5968f08309b980b60
diff --git a/runtime/oat_file.cc b/runtime/oat_file.cc
index 7c320d8..af87637 100644
--- a/runtime/oat_file.cc
+++ b/runtime/oat_file.cc
@@ -1039,11 +1039,8 @@
     }
 #ifdef ART_TARGET_ANDROID
     android_dlextinfo extinfo = {};
-    extinfo.flags = ANDROID_DLEXT_FORCE_LOAD |                  // Force-load, don't reuse handle
-                                                                //   (open oat files multiple
-                                                                //    times).
-                    ANDROID_DLEXT_FORCE_FIXED_VADDR;            // Take a non-zero vaddr as absolute
-                                                                //   (non-pic boot image).
+    extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;   // Force-load, don't reuse handle
+                                                //   (open oat files multiple times).
     if (reservation != nullptr) {
       if (!reservation->IsValid()) {
         *error_msg = StringPrintf("Invalid reservation for %s", elf_filename.c_str());