Revert "Include all_aconfig_declarations in docs dist"

This reverts commit 90c2af97.

Reason for revert: Includes too many flags.  The on-device copy of aconfig declarations must be **only** those that are used by code on the device.  `all_aconfig_declarations` is every aconfig flag in the source tree, and cannot be placed on the device.

Change-Id: Id7ac61c0805825b4ca27fffe84a48f95e3c682b2