Update sample config.xml file to use 64-bit aosp_cf_x86_64_phone.

Change-Id: Iee1d851a2363b3d41a5488fac7da91179736d98d
diff --git a/build/sandbox/sample_config.xml b/build/sandbox/sample_config.xml
index 070749f..3c75217 100644
--- a/build/sandbox/sample_config.xml
+++ b/build/sandbox/sample_config.xml
@@ -3,19 +3,19 @@
 Defines sample build configuration file.
 -->
 <config>
-  <target name="aosp_cf_x86_phone_default" android_target="aosp_cf_x86_phone" 
+  <target name="aosp_cf_x86_64_phone_default" android_target="aosp_cf_x86_64_phone"
       allow_readwrite_all="true">
     <!-- Target elements can define elements and attributes that are inherited
          by build_config child elements. -->
     <goal name="droid"/>
     <build_config>
-      <!-- build_config name will inherit the name aosp_cf_x86_phone_default
+      <!-- build_config name will inherit the name aosp_cf_x86_64_phone_default
            and append dist to the flag list. -->
       <flag name="dist"/>
     </build_config>
-    <build_config name="aosp_cf_x86_phone_no_dist" tags="skip">
+    <build_config name="aosp_cf_x86_64_phone_no_dist" tags="skip">
     </build_config>
-    <build_config name="aosp_cf_x86_phone_ro" allow_readwrite_all="false">
+    <build_config name="aosp_cf_x86_64_phone_ro" allow_readwrite_all="false">
       <!-- This build_config will override allow_readwrite_all attribute. -->
     </build_config>
     <build_config name="aosp_cf_x86_tv" android_target="aosp_cf_x86_tv">