crossystem: remove mosys nvstorage implementation

As promised, it's October 2020, nyan_kitty went AUE with M85, and M86
just got pushed stable.  That means we can now delete this code :)

BUG=chromium:1090803
BRANCH=none
TEST=compiles

Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Change-Id: I5a15ef1e1ad02885af135d8e42d02d492bdd6c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2469604
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
3 files changed