clk: sunxi-ng: mux: Remove unused 'reg' field

The driver uses 'reg' from 'struct ccu_common' everywhere, so this
duplicate field is unused and unnecessary. Remove it.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210902230336.29745-1-samuel@sholland.org

drivers/clk/sunxi-ng/ccu_mux.h

@@ -40,7 +40,6 @@ struct ccu_mux_internal {
 	_SUNXI_CCU_MUX_TABLE(_shift, _width, NULL)
 
 struct ccu_mux {
-	u16			reg;
 	u32			enable;
 
 	struct ccu_mux_internal	mux;