FROMLIST: dt-bindings: hypervisor: Add MediaTek GenieZone hypervisor

Add documentation for GenieZone(gzvm) node. This node informs gzvm
driver to start probing if geniezone hypervisor is available and
able to do virtual machine operations.

[Reason to use dt solution]
- The GenieZone hypervisor serves as a vendor model for facilitating platform
virtualization, with an implementation that is independent from Linuxism.
- In contrast to the dt solution, our previous approach involved probing via
hypercall to determine the existence of our hypervisor. However, this method
raised concerns about potentially impacting all systems, including those
without the GenieZone hypervisor embedded[ref].

ref: https://lore.kernel.org/all/2fe0c7f9-55fc-ae63-3631-8526a0212ccd@linaro.org/



Change-Id: I84a94dfe51e817f18f458f7a8d9ea1eff37e1adb
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/20231228105147.13752-3-yi-de.wu@mediatek.com/