habanalabs: fix endianness when reading cpld version

Current sysfs implementation does not take endianness into
consideration when dumping the cpld version.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>