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

include/hsakmt.h

@@ -374,8 +374,8 @@ hsaKmtFreeMemory(
 HSAKMT_STATUS
 HSAKMTAPI
 hsaKmtRegisterMemory(
-    void*       MemoryAddress,      //IN (page-aligned)
-    HSAuint64   MemorySizeInBytes   //IN (page-aligned)
+    void*       MemoryAddress,      //IN (cache-aligned)
+    HSAuint64   MemorySizeInBytes   //IN (cache-aligned)
     );
 
 
@@ -386,8 +386,8 @@ hsaKmtRegisterMemory(
 HSAKMT_STATUS
 HSAKMTAPI
 hsaKmtRegisterMemoryToNodes(
-    void        *MemoryAddress,     // IN (page-aligned)
-    HSAuint64   MemorySizeInBytes,  // IN (page-aligned)
+    void        *MemoryAddress,     // IN (cache-aligned)
+    HSAuint64   MemorySizeInBytes,  // IN (cache-aligned)
     HSAuint64   NumberOfNodes,      // IN
     HSAuint32*  NodeArray           // IN
     );