Test: Add configuration for FWU secure test suites

The secure test suites is only enabled when the FWU partition
and the TFM_FWU_TEST_SECURE is enabled.

Signed-off-by: Sherry Zhang <sherry.zhang2@arm.com>
Change-Id: I8290d95d57cd93405865e6b1037ab328d23ac2e8
3 files changed