accel/habanalabs: remove wrong doc for init_phys_pg_pack_from_userptr

The function does not pin the pages so remove that from the inline doc.

Signed-off-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>