misc: genwqe: card_sysfs: Demote function/file headers from kerneldoc

There has been no attempt to provide documentation for these function's
arguments, so align with the remainder of the file and just treat
them as standards function headers.

Fixes the following W=1 kernel build warnings:

drivers/misc/genwqe/card_sysfs.c:32: warning: cannot understand function prototype: 'const char * const genwqe_types[] = '
drivers/misc/genwqe/card_sysfs.c:150: warning: Function parameter or member 'dev' not described in 'curr_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:150: warning: Function parameter or member 'attr' not described in 'curr_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:150: warning: Function parameter or member 'buf' not described in 'curr_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:166: warning: Function parameter or member 'dev' not described in 'next_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:166: warning: Function parameter or member 'attr' not described in 'next_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:166: warning: Function parameter or member 'buf' not described in 'next_bitstream_show'
drivers/misc/genwqe/card_sysfs.c:271: warning: Function parameter or member 'kobj' not described in 'genwqe_is_visible'
drivers/misc/genwqe/card_sysfs.c:271: warning: Function parameter or member 'attr' not described in 'genwqe_is_visible'
drivers/misc/genwqe/card_sysfs.c:271: warning: Function parameter or member 'n' not described in 'genwqe_is_visible'

Cc: Michael Jung <[e-mail]>
Cc: Michael Ruettger <[e-mail]>
Cc: Frank Haverkamp <[e-mail]>
Cc: Joerg-Stephan Vogt <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/genwqe/card_sysfs.c

···
 // SPDX-License-Identifier: GPL-2.0-only
-/**
+/*
  * IBM Accelerator Family 'GenWQE'
  *
  * (C) Copyright IBM Corp. 2013
···
 }
 static DEVICE_ATTR_RO(base_clock);
 
-/**
+/*
  * curr_bitstream_show() - Show the current bitstream id
  *
  * There is a bug in some old versions of the CPLD which selects the
···
 }
 static DEVICE_ATTR_RO(curr_bitstream);
 
-/**
+/*
  * next_bitstream_show() - Show the next activated bitstream
  *
  * IO_SLC_CFGREG_SOFTRESET: This register can only be accessed by the PF.
···
 	NULL,
 };
 
-/**
+/*
  * genwqe_is_visible() - Determine if sysfs attribute should be visible or not
  *
  * VFs have restricted mmio capabilities, so not all sysfs entries