cros-kernel2: remove the outputs of "depmod"

Since CL:446687, "build_image" script will run "depmod". So kernel
packages should not own the outputs of "depmod".

BUG=chromium:695675
TEST=See CL:446687
CQ-DEPEND=CL:446687,CL:451798

Change-Id: I3909503599f9af0e95a02613fb43384c6badc270
Reviewed-on: https://chromium-review.googlesource.com/446890
Commit-Ready: Edward Jee <edjee@google.com>
Tested-by: Edward Jee <edjee@google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
1 file changed