doc: HV startup and CPU virtualization sections

transcode, edit, and upload HLD 0.7 sections 3.1 and 3.2

Tracked-on: #1533

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

Author: dbkinder

doc/developer-guides/hld/hld-hypervisor.rst

@@ -7,6 +7,8 @@ Hypervisor high-level design
 .. toctree::
    :maxdepth: 1
 
+   hv-startup
+   hv-cpu-virt
    static-core-hld
    Memory management <memmgt-hld>
    Interrupt management <interrupt-hld>