soc: qcom: hyp-debug: add hypervisor debug driver

Add Hypervisor Debug driver that provides a debugfs user
interface to allow physical memory ranges to be mapped and
unmapped from stage 2. It also registers with subsystem restart
driver to map and unmap peripheral image memory regions.

This will help debug illegal memory accesses by forcing them to
create synchronous stage 2 exceptions.

Change-Id: Ie87f9b01bb6ad8c24c99b6bbd5236f224394642b
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>