Current memory allocation algorithm is to find the available address from
the highest possible address below max_address. If the function returns 0,
means all memory is used up and we have to put the resource at address 0,
this is dangerous for a running hypervisor.
Also returns 0 would make code logic very complicated, since memcpy_s()
doesn't support address 0 copy.
Tracked-On: #5626
Signed-off-by: Victor Sun <victor.sun@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
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