i2c: Staticize local functions in mxc i2c driver

Some functions in the MXC i2c driver were not static, fix this by
making them so.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

drivers/i2c/mxc_i2c.c

@@ -115,7 +115,7 @@ static uint8_t i2c_imx_get_clk(unsigned int rate)
 /*
  * Set I2C Bus speed
  */
-int bus_i2c_set_bus_speed(void *base, int speed)
+static int bus_i2c_set_bus_speed(void *base, int speed)
 {
 	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
 	u8 clk_idx = i2c_imx_get_clk(speed);
@@ -133,7 +133,7 @@ int bus_i2c_set_bus_speed(void *base, int speed)
 /*
  * Get I2C Speed
  */
-unsigned int bus_i2c_get_bus_speed(void *base)
+static unsigned int bus_i2c_get_bus_speed(void *base)
 {
 	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
 	u8 clk_idx = readb(&i2c_regs->ifdr);