drivers/i2c/fsl_i2c.c: sparse fix

fsl_i2c.c:217:14: warning: symbol 'get_i2c_clock' was not declared. Should it be static?
Signed-off-by: NKim Phillips <kim.phillips@freescale.com>
Acked-by: NHeiko Schocher <hs@denx.de>

drivers/i2c/fsl_i2c.c

@@ -214,7 +214,7 @@ static unsigned int set_i2c_bus_speed(const struct fsl_i2c *dev,
 	return speed;
 }
 
-unsigned int get_i2c_clock(int bus)
+static unsigned int get_i2c_clock(int bus)
 {
 	if (bus)
 		return gd->i2c2_clk;	/* I2C2 clock */