habanalabs/gaudi: replace hl_poll_timeout with while loop

in gaudi_scrub_device_mem, replace call to hl_poll_timeout
with a while loop to avoid using dummy variables.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>