NFC: Fix function descriptions

Fix function description comments according to kernel-doc. Also,
remove unnecessary arguments.

Change-Id: I66c9e47ee5cd6fe6ae8676256e4b6ee30fe2d61f
Acked-by: Afroditi Ilioudi <ailioudi@qti.qualcomm.com>
Signed-off-by: Puneet Mishra <puneetm@codeaurora.org>