staging: r8188eu: remove HW_VAR_SEC_CFG

Remove HW_VAR_SEC_CFG from SetHwReg8188EU() and call rtw_write8()
directly.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220130190321.7172-3-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>