THUNK: fix deregister memory issues

__fmm_release actually fails to find the object if address is not
pagesize aligned.  And the caller did not notice this as __fmm_release
has no err code return.

So to fix this, move the object lookup in caller, and use vm-object
instead. Also fmm_release will pass up the error code.

Change-Id: Ib8ea1ea5ae844844fd20e8e01f0fdb841d218f2c
Signed-off-by: xinhui pan <xinhui.pan@amd.com>

src/fmm.h

@@ -54,7 +54,7 @@ void *fmm_allocate_doorbell(uint32_t gpu_id, uint64_t MemorySizeInBytes, uint64_
 void *fmm_allocate_host(uint32_t node_id, uint64_t MemorySizeInBytes,
 			HsaMemFlags flags);
 void fmm_print(uint32_t node);
-void fmm_release(void *address);
+HSAKMT_STATUS fmm_release(void *address);
 int fmm_map_to_gpu(void *address, uint64_t size, uint64_t *gpuvm_address);
 int fmm_unmap_from_gpu(void *address);
 bool fmm_get_handle(void *address, uint64_t *handle);