cr50_fuzz: Fix missing dependencies.
cr50_fuzz: Fix missing dependencies.

This fixes a dependency problem that was introduced in CL:1184107.

BRANCH=None
BUG=chromium:911310
TEST=USE="ubsan asan fuzzer" ./build_packages \
  --board=amd64-generic --skip_chroot_upgrade chromeos-ec

Change-Id: Ib4795d6a716fe3fcb7a88bf6a165f96ffe10640a
Signed-off-by: Allen Webb <880184b418addffb87cd9c8e8e882ca6764ac96b@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1358746
Reviewed-by: Mattias Nissler <f2124f8e21694335a48d099eb9510c5c4dda0d0b@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec