Remove root key

We don't use root key to verify NVIDIA driver
signature anymore.

BUG=b/391455624
TEST=prsubmit
RELEASE_NOTE=None

cos-patch: bug
Signed-off-by: He Gao <hegao@google.com>
Change-Id: Ib6f34b226def63a0a7e11e5fa5843877d38073cf
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/92101
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Shuo Yang <gshuoy@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
3 files changed