Deprecate cc_binary aconfigd and the controlling flag

cc_binary aconfigd is replaced with rust_binary aconfigd-system. The
replacement is flag guarded and is already in TF full for more than a
week. Thus delete the flag and deprecate old cc_binary aconfigd.

Test: m
(cherry picked from https://android-review.googlesource.com/q/commit:2c23562d34e8b631296590304a12cd297da77b36)
Merged-In: I4c9ab2c57b50aaeed81f8a7db39bd1f88d31605d
Change-Id: I4c9ab2c57b50aaeed81f8a7db39bd1f88d31605d