[chip/testplan] Add cross reference tests in otp
[chip/testplan] Add cross reference tests in otp

This PR adds cross reference for two testplan items under OTP_CTRL.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@opentitan.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan