feat(rmm): modify API of RMI_RTT_INIT_RIPAS

This patch modifies API of RMI_RTT_INIT_RIPAS
command handler as per RMM Specification 1.0-eac1:
- 'base' and 'top' parameters are passed in arg1 and arg2.
- 'out_top' value is returned in X1.

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: Ibcf6a20ecc1a991ca868928a240d3060cf74a45f
8 files changed