feat(rmm-eac4): modify RSI_ATTESTATION_TOKEN commands

Modifies RSI_ATTESTATION_TOKEN_INIT and
RSI_ATTESTATION_TOKEN_CONTINUE commands as per
RMM Specification 1.0-eac4.
Number of 4K pages allocated for attestation
buffer is defined by RMM_ATTEST_BUFFER_PAGES
in CommonConfigs.cmake and set to 1 by default.

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: Icda7f26e291a19b143ae14a291c03cc7bda0e076
9 files changed