Stop trying to get/set fields in FDE footer

Now that FDE is no longer supported, getting/setting FDE fields is
always a no-op, so there is no need to do so.

Bug: 208476087
Change-Id: Iab7ba8d36890daa0645b2cedf33e4bd177a86b63
(cherry picked from commit c6ce767e594a7bdbf6e9c00382bffa6b5fb689aa)
Merged-In: Iab7ba8d36890daa0645b2cedf33e4bd177a86b63
3 files changed