DO NOT MERGE Disable docs federation in 25.4 branch
DO NOT MERGE Disable docs federation in 25.4 branch

Without a local API file, docs will attempt to read APIs from
the network, which may cause the build to fail. We don't need
federation in 25.4 docs, so this CL turns it off completely.

Bug: 36086933
Test: ./gradlew generateDocs
Change-Id: Ibb986154b10625c67c5fa1b2bdb99c72eeb8733c

androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,aosp-mirror/platform_frameworks_support,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support