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

 drivers/net/usb/r8152.c:992: warning: Function parameter or member 'mode_pre' not described in 'fw_phy_nc'
 drivers/net/usb/r8152.c:992: warning: Function parameter or member 'mode_post' not described in 'fw_phy_nc'
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Acked-by: NHayes Wang <hayeswang@realtek.com>
Link: https://lore.kernel.org/r/20201102114512.1062724-28-lee.jones@linaro.orgSigned-off-by: NJakub Kicinski <kuba@kernel.org>