Revert "Disable the design support library and demos"

This reverts commit 97930fc88b.

Change-Id: I363014ddaa19db82f076875a36b4c3c8697eb9cb

build/sdk.atree

@@ -492,6 +492,11 @@ frameworks/support/v17/leanback/res
 frameworks/support/v17/leanback/src/.readme                                                       extras/android/support/v17/leanback/src/.readme
 ${OUT_DIR}/target/common/obj/PACKAGING/android-support-v17-leanback_intermediates/android-support-v17-leanback.jar    extras/android/support/v17/leanback/libs/android-support-v17-leanback.jar
 
+frameworks/support/design/AndroidManifest.xml                                                     extras/android/support/design/AndroidManifest.xml
+frameworks/support/design/res                                                                     extras/android/support/design/res
+frameworks/support/design/src/.readme                                                             extras/android/support/design/src/.readme
+${OUT_DIR}/target/common/obj/PACKAGING/android-support-design_intermediates/android-support-design.jar    extras/android/support/design/libs/android-support-design.jar
+
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 # Tests Component
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