Move fuzz phony to be make-defined, and add to dist.

Add the fuzz packages to dist. This requires that the phony for 'make'
be define in make itself, rather than in Soong. See comments on other
patch in topic for more information.

Bug: 141026328
Test: m fuzz dist

Change-Id: I4cd476adcfa42e4b40911c4a32427a7b00c67cc3