mxc_i2c: fix i2c_imx_stop

Instead of clearing 2 bits, all the other
bits were set because '|=' was used instead
of '&='.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

drivers/i2c/mxc_i2c.c

@@ -264,7 +264,7 @@ void i2c_imx_stop(void)
 
 	/* Stop I2C transaction */
 	temp = readb(&i2c_regs->i2cr);
-	temp |= ~(I2CR_MSTA | I2CR_MTX);
+	temp &= ~(I2CR_MSTA | I2CR_MTX);
 	writeb(temp, &i2c_regs->i2cr);
 
 	i2c_imx_bus_busy(0);