staging: r8188eu: remove HW_VAR_TXPAUSE

SetHwReg8188EU() and GetHwReg8188EU() are never called with
HW_VAR_TXPAUSE. Remove that case from both functions.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107215033.12257-3-straube.linux@gmail.com


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