Remove fuzzer test runs from buildall.
Remove fuzzer test runs from buildall.

This removes the test runs for fuzzer targets temporarily until
crbug.com/918662 is resolved.

BRANCH=None
BUG=chromium:918662
TEST=make -j buildall

Change-Id: I80b9c4cd403924e41704462277da6d288796abc8
Signed-off-by: Allen Webb <880184b418addffb87cd9c8e8e882ca6764ac96b@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1399201
Reviewed-by: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>

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