test(memory share): use SMC64 rather than SMC32

The SPMC supports memory sharing interfaces to use the
SMC64 or SMC32 abis.
There was not functional change with this. However, making
TF-A-Tests use SMC64 to validate that they both work.
Hafnium tests will remain using the SMC32 version of the
ABIs.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I31e275ca50973774928591eef0128f0cf0f5be8b
8 files changed