Merge #246 246: tock: Bump to the 1.6 release r=jrvanwhy a=alistair23 Bump to the latest release. This now uses a long lasting OpenTitan boot ROM to avoid CI failures, see https://github.com/tock/tock/pull/2170 Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Co-authored-by: Alistair Francis <alistair.francis@wdc.com>