Add support for register/deregister memory for dGPU

Allocate SVM address space for the registered memory and use new
userptr support in KFD to create a system memory BO associated with
the given user pointer. Map this BO at the SVM address for CPU
access.

MapMemoryToGPU can be used with the registered user pointer and
will return the SVM address as alternate GPUVA.

Change-Id: I4886e193c51fb6870a567878870c36bf8b5c3748

src/fmm.h

@@ -69,7 +69,7 @@ HSAKMT_STATUS fmm_node_removed(HSAuint32 gpu_id);
 HSAKMT_STATUS fmm_get_aperture_base_and_limit(aperture_type_e aperture_type, HSAuint32 gpu_id,
 		HSAuint64 *aperture_base, HSAuint64 *aperture_limit);
 
-HSAKMT_STATUS fmm_register_memory(void *address, uint32_t size_in_bytes,
+HSAKMT_STATUS fmm_register_memory(void *address, uint64_t size_in_bytes,
                                   uint32_t *gpu_id_array,
                                   uint32_t gpu_id_array_size);
 HSAKMT_STATUS fmm_deregister_memory(void *address);