usb: c67x00: c67x00-hcd: Demote obvious misuse of kerneldoc to standard comment blocks

usb: c67x00: c67x00-hcd: Demote obvious misuse of kerneldoc to standard comment blocks

No attempt has been made to document any of the functions here.

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

 drivers/usb/c67x00/c67x00-hcd.c:237: warning: Function parameter or member 'sie' not described in 'c67x00_hcd_irq'
 drivers/usb/c67x00/c67x00-hcd.c:237: warning: Function parameter or member 'int_status' not described in 'c67x00_hcd_irq'
 drivers/usb/c67x00/c67x00-hcd.c:237: warning: Function parameter or member 'msg' not described in 'c67x00_hcd_irq'
 drivers/usb/c67x00/c67x00-hcd.c:267: warning: Function parameter or member 'hcd' not described in 'c67x00_hcd_start'
 drivers/usb/c67x00/c67x00-hcd.c:279: warning: Function parameter or member 'hcd' not described in 'c67x00_hcd_stop'

Cc: Peter Korsgaard <jacmet@sunsite.dk>
Cc: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200715093209.3165641-7-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>