OvmfPkg/IoMmuDxe: rename HostAddress to CryptedAddress in MAP_INFO

OvmfPkg/IoMmuDxe: rename HostAddress to CryptedAddress in MAP_INFO

As a continuation of the last patch, clarify that the area pointed-to by
"HostAddress" is encrypted and hidden from the hypervisor.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>