tsi108_i2c: Add i2c_init() stub function

Add the i2c_init() function so that the tsi108_i2c.c driver fits
U-Boot's standard I2C API which is utilized by cmd_i2c.c

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

drivers/i2c/tsi108_i2c.c

@@ -41,6 +41,15 @@
 /* All functions assume that Tsi108 I2C block is the only master on the bus */
 /* I2C read helper function */
 
+void i2c_init(int speed, int slaveaddr)
+{
+	/*
+	 * The TSI108 has a fixed I2C clock rate and doesn't support slave
+	 * operation.  This function only exists as a stub to fit into the
+	 * U-Boot I2C API.
+	 */
+}
+
 static int i2c_read_byte (
 		uint i2c_chan,	/* I2C channel number: 0 - main, 1 - SDC SPD */
 		uchar chip_addr,/* I2C device address on the bus */