habanalabs: fix debugfs device memory MMU VA translation

The translation in debugfs of device memory MMU virtual addresses was
wrong as it did not take into consideration the fact that the page
sizes there can be not power of 2.

Signed-off-by: Yuri Nudelman <ynudelman@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>