ata: pata_parport: Fix bpck module code indentation and style

Fix the header, indentation and coding style in the bpck pata parport
protocol module to suppress smatch warnings such as:

drivers/ata/pata_parport/bpck.c:66 bpck_read_regr() warn: inconsistent indenting

No functional changes.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202305021913.nCMzH5Zj-lkp@intel.com/Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>