docs(rmmd): document the EL3-RMM IDE KM Interface

This patch updates the documentation for the EL3-RMM IDE KM interface,
addressing errors found in the previous version and fixed formatting
issues and added missing details.

Change-Id: I84ff734d3de755fa793620e9b1446cf9b75763b0
Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
1 file changed