arm: at91: G45 TWI: remove open drain setting for twi function gpios

The G45 datasheets explicitly states that setting the open drain property
on peripheral function gpios is not allowed. (How about other A91 chips?)
Signed-off-by: NNikolaus Voss <n.voss@weinmann.de>
Tested-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Reviewed-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>

arch/arm/mach-at91/at91sam9g45_devices.c

@@ -686,18 +686,12 @@ void __init at91_add_device_i2c(short i2c_id, struct i2c_board_info *devices, in
 	/* pins used for TWI interface */
 	if (i2c_id == 0) {
 		at91_set_A_periph(AT91_PIN_PA20, 0);		/* TWD */
-		at91_set_multi_drive(AT91_PIN_PA20, 1);
-
 		at91_set_A_periph(AT91_PIN_PA21, 0);		/* TWCK */
-		at91_set_multi_drive(AT91_PIN_PA21, 1);
 
 		platform_device_register(&at91sam9g45_twi0_device);
 	} else {
 		at91_set_A_periph(AT91_PIN_PB10, 0);		/* TWD */
-		at91_set_multi_drive(AT91_PIN_PB10, 1);
-
 		at91_set_A_periph(AT91_PIN_PB11, 0);		/* TWCK */
-		at91_set_multi_drive(AT91_PIN_PB11, 1);
 
 		platform_device_register(&at91sam9g45_twi1_device);
 	}