Camera: Enable 64-bit cameraserver builds

Allow 64-bit builds on 64-bit devices.

Bug: 135535544
Test: Manual using camera application and setting "adb shell date
060910002043.00", Camera CTS

Change-Id: I665da3c5b9a1ee3c9a061a7370a62ecff517ee6a
diff --git a/camera/cameraserver/Android.bp b/camera/cameraserver/Android.bp
index a354189..5c3e3b0 100644
--- a/camera/cameraserver/Android.bp
+++ b/camera/cameraserver/Android.bp
@@ -37,7 +37,7 @@
         "android.hardware.camera.device@3.2",
         "android.hardware.camera.device@3.4",
     ],
-    compile_multilib: "prefer32",
+    compile_multilib: "first",
     cflags: [
         "-Wall",
         "-Wextra",