update_kernel: Remove depmod logic

All of this 'run depmod' logic is unnecessary. Originally we introduced
this logic in here because chromium:451798 was making up for the fact
that the eclass change (chromium:446890) no longer installed kernel
modules. But that broke the waterfall and the eclass change got reverted
(see chromium:455341). In the end, we were left with running depmod in
update_kernel.sh when we don't really need to because the kernel
makefile will run depmod for us when 'modules_install' is called by the
kernel eclass in the src_install step.

Let's just remove this logic here to avoid it all.

BUG=chromium:695675
TEST=update_kernel on cheza, see that modules.dep matches
/build/cheza/lib/modules/<version>/modules.dep

Change-Id: Ic9c1e58f704a01789550e9fa7f628eb9f89c1e41
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1933594
Tested-by: Stephen Boyd <swboyd@chromium.org>
Auto-Submit: Stephen Boyd <swboyd@chromium.org>
Commit-Queue: Brian Norris <briannorris@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
diff --git a/update_kernel.sh b/update_kernel.sh
index 13efa02..eda1eab 100755
--- a/update_kernel.sh
+++ b/update_kernel.sh
@@ -196,25 +196,6 @@
   fi
   info "Copying modules"
   remote_send_to "${modules_dir}" "${basedir}"/lib/modules
-  local kernel_release
-  local kernel_releases
-  remote_sh "cd ${basedir}/lib/modules; echo *"
-  IFS=" " read -a kernel_releases <<< "${REMOTE_OUT}"
-  for kernel_release in "${kernel_releases[@]}"; do
-    local system_map="${modules_dir}"/"${kernel_release}"/build/System.map
-    if [ -r "${system_map}" ]; then
-      remote_sh mktemp -d /tmp/update_kernel_system_map_"${kernel_release}".XXXXXX
-      local temp_dir="${REMOTE_OUT}"
-      remote_cp_to "${system_map}" "${temp_dir}"
-      local b_opt
-      if [ -n "${basedir}" ]; then
-        b_opt="-b ${basedir}"
-      fi
-      remote_sh depmod "${b_opt}" -ae \
-                       -F "${temp_dir}"/System.map "${kernel_release}"
-      remote_sh rm -rf "${temp_dir}"
-    fi
-  done
 }
 
 copy_kernelimage() {