habanalabs: Fix memory corruption in debugfs

This has to be a long instead of a u32 because we write a long value.
On 64 bit systems, this will cause memory corruption.

Fixes: c2164773 ("habanalabs: add debugfs support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>