Rename "api_refs" to "apiRefs" in packaging.yaml output

Updating to match correct spelling used by the packaging spec.

Change-Id: Iab018105a56a559e030d4e45af4556a653ee4adc
diff --git a/templates/base/.google/packaging.yaml.ftl b/templates/base/.google/packaging.yaml.ftl
index b655594..fb0a440 100644
--- a/templates/base/.google/packaging.yaml.ftl
+++ b/templates/base/.google/packaging.yaml.ftl
@@ -15,7 +15,7 @@
 </#if><#if sample.metadata.icon?is_node>
 icon:         ${sample.metadata.icon}
 </#if><#if sample.metadata.api_refs?is_node>
-api_refs:
+apiRefs:
 <#list sample.metadata.api_refs.android as ref>
     - android:${ref}
 </#list>
diff --git a/templates/basebuild/.google/packaging.yaml.ftl b/templates/basebuild/.google/packaging.yaml.ftl
index b655594..fb0a440 100644
--- a/templates/basebuild/.google/packaging.yaml.ftl
+++ b/templates/basebuild/.google/packaging.yaml.ftl
@@ -15,7 +15,7 @@
 </#if><#if sample.metadata.icon?is_node>
 icon:         ${sample.metadata.icon}
 </#if><#if sample.metadata.api_refs?is_node>
-api_refs:
+apiRefs:
 <#list sample.metadata.api_refs.android as ref>
     - android:${ref}
 </#list>