feat(rme): add dev mem map/unmap tests

- Add tests for RMI_DEV_MEM_MAP and
RMI_DEV_MEM_UNMAP commands as per RMM Specification 1.1-alp12.
- Add RNDR and RNDRRS registers' definitions.
- Redefine RNDR and RNDRRS read functions as:
DEFINE_RENAME_SYSREG_READ_FUNC(rndr, RNDR)
DEFINE_RENAME_SYSREG_READ_FUNC(rndrrs, RNDRRS)

Change-Id: Ieecc41dd6d3011bb63101bc38d527a8f57e0ef4a
Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
9 files changed