Rewrite function definitions in the UFS/FFS code base with identifier lists.

No functional change to the code.

(cherry picked from commit 064e6b4303d8aec9cfd27653d4dd2abea829a6c7)

Fixes to build from 064e6b4:

(cherry picked from commit c792466f878a082a63683d3a8a1f7b468081d835)

(cherry picked from commit 2e66649e4f34188d92bd32b5ba7fde8d1e86ef40)