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

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

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

 drivers/usb/host/bcma-hcd.c:180: warning: Function parameter or member 'usb_dev' not described in 'bcma_hcd_usb20_old_arm_init'
 drivers/usb/host/bcma-hcd.c:268: warning: Function parameter or member 'bcma_hcd' not described in 'bcma_hcd_usb20_ns_init'

Cc: Chuhong Yuan <hslester96@gmail.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Michael Buesch <m@bues.ch>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200706133341.476881-21-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/bcma-hcd.c

@@ -168,7 +168,7 @@ static void bcma_hcd_init_chip_mips(struct bcma_device *dev)
 	}
 }
 
-/**
+/*
  * bcma_hcd_usb20_old_arm_init - Initialize old USB 2.0 controller on ARM
  *
  * Old USB 2.0 core is identified as BCMA_CORE_USB20_HOST and was introduced
@@ -261,7 +261,7 @@ static void bcma_hcd_usb20_ns_init_hc(struct bcma_device *dev)
 	usleep_range(1000, 2000);
 }
 
-/**
+/*
  * bcma_hcd_usb20_ns_init - Initialize Northstar USB 2.0 controller
  */
 static int bcma_hcd_usb20_ns_init(struct bcma_hcd_device *bcma_hcd)