habanalabs: set dma mask from fw once fw done iatu config

When setting "DMA mask from FW" we are reading PSOC_GLOBAL_CONF register
which is allowed only once FW has done it's iATU configuration.

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>