plat: tc0: set PLAT_CACTUS_CORE_COUNT, disable SMMUv3 tests

Define platform specific SMMUv3 test driver macros. These macros will
be set to proper values once SMMUv3 is enabled for TC platform.

Disables SMMUv3 tests.
Enables PSCI NODE_HW_STATE API test.

Change-Id: I1bd0f362521d892d4b33a2188bf8c5065c45d6f0
Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
3 files changed