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
Change-Id: Ib128adc2ef8178e02222f77e6b89bcc7ac83c1da