SecureBoot: Remove the check for secure mode for KT test
SecureBoot: Remove the check for secure mode for KT test

Key transition can be done on non-secure mode systems as well. So
remove the redundant check of secure mode.

Signed-off-by: Pridhiviraj Paidipeddi <fd8ea14509c256cbd04eaa4ee745a213945e70a1@linux.vnet.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework