i2c, soft_i2c: deblock bus if switching to another i2c bus

Deblock i2c bus when switching to another i2c bus, if using
i2c_set_bus_num().

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>

drivers/i2c/soft_i2c.c

@@ -286,6 +286,7 @@ int i2c_set_bus_num(unsigned int bus)
 		int	ret;
 
 		ret = i2x_mux_select_mux(bus);
+		i2c_init_board();
 		if (ret == 0)
 			i2c_bus_num = bus;
 		else