H_INIT_PAGE hcall from SVM must be handled locally by Ultravisor

[rampai]

Currently it is reflecting it to the Hypervisor. Hypervisor cannot do anything with the Hcall, since it does not have access to the secure page.

Ultravisor must handle it locally and return to the SVM.

BTW: AFAICT this hcall is made only by Hash Guests. Since we do not support Hash Guests, we have not encountered this problem. However its better to handle this call gracefully, either by handling it, or returning a U_FUNCTION error code.