habanalabs: fix vma fields assignments order in hl_hw_block_mmap()

In hl_hw_block_mmap(), the vma's 'vm_private_data' and 'vm_ops' fields
are assigned before filling the content of the private data.
In between there is a call to the ASIC hw_block_mmap() function, and if
it fails, the vma close function will be called with a bad private data
value.
Fix the order of assignments to avoid this issue.

In hl_hw_block_mmap() the vma's 'vm_private_data and vm_ops are assigned
before setting the

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>