mxc_i2c: remove setting speed at each start

Other then being very weird, this code was also wrong.
For example, say I set speed to 100K. I'll read back the speed
as 85937. But the speed is really 85937.5, so we I reset
the speed to 85937, I'll get 73660.7. After a couple of transactions
my speed is now exactly 68750 so it will remain there.

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

@@ -231,12 +231,6 @@ int i2c_imx_start(void)
 	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)I2C_BASE;
 	unsigned int temp = 0;
 	int result;
-	int speed = i2c_get_bus_speed();
-	u8 clk_idx = i2c_imx_get_clk(speed);
-	u8 idx = i2c_clk_div[clk_idx][1];
-
-	/* Store divider value */
-	writeb(idx, &i2c_regs->ifdr);
 
 	/* Enable I2C controller */
 	writeb(0, &i2c_regs->i2sr);