update_kernel.sh: Do not update kernel if verity is on

This has bitten me many times: system uses verity, so only the kernel
is updated, the board reboots, but without modules Ethernet adapter
does not work anymore, and there is no (easy) way to fix the mistake.

TEST=./update_kernel.sh --remote=IP

Change-Id: I208fbc8b5356e4839b54f5108ec3435187c064d7
Reviewed-on: https://chromium-review.googlesource.com/358291
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
1 file changed