wil6210: debugfs: Fix a couple of formatting issues in 'wil6210_debugfs_init'

Kerneldoc expects attributes/parameters to be in '@*.: ' format and
gets confused if the variable does not follow the type/attribute
definitions.

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/ath/wil6210/debugfs.c:456: warning: Function parameter or member 'wil' not described in 'wil6210_debugfs_init_offset'
 drivers/net/wireless/ath/wil6210/debugfs.c:456: warning: Function parameter or member 'dbg' not described in 'wil6210_debugfs_init_offset'
 drivers/net/wireless/ath/wil6210/debugfs.c:456: warning: Function parameter or member 'base' not described in 'wil6210_debugfs_init_offset'
 drivers/net/wireless/ath/wil6210/debugfs.c:456: warning: Function parameter or member 'tbl' not described in 'wil6210_debugfs_init_offset'

Cc: Maya Erez <merez@codeaurora.org>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: wil6210@qti.qualcomm.com
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200819072402.3085022-22-lee.jones@linaro.org