FROMLIST: docs: geniezone: Introduce GenieZone hypervisor

GenieZone is MediaTek proprietary hypervisor solution, and it is running
in EL2 stand alone as a type-I hypervisor. It is a pure EL2
implementation which implies it does not rely any specific host VM, and
this behavior improves GenieZone's security as it limits its interface.

Change-Id: I4fabed220ae4753932a5a8825b0d6d52766b1d0f
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@mediatek.com>
Signed-off-by: Liju Chen <liju-clr.chen@mediatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu@mediatek.com>
Bug: 318443644
Link: https://lore.kernel.org/all/20231228105147.13752-2-yi-de.wu@mediatek.com/