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Minimal payload initialization for the virt machine model.
Setup a stack and jump to C code, where CPU0 will boot any
discovered secondary cores through PSCI. Immediately after
all cores are turned-off and the guest is powered down.

Added printf functionality is based on the multiboot test. In a
similar manner this test is standalone and not part of 'make check'.
Suggested-by: Jani Kokkonen <jani.kokkonen@huawei.com>
Suggested-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Alexander Spyridakis <a.spyridakis@virtualopensystems.com>