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 <[email protected]>
Change-Id: Ib6f34b226def63a0a7e11e5fa5843877d38073cf
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/92101
Main-Branch-Verified: Cusky Presubmit Bot <[email protected]>
Reviewed-by: Shuo Yang <[email protected]>
Tested-by: Cusky Presubmit Bot <[email protected]>
3 files changed