i2c: lpc32xx: Force consistent bus numbering

Normally, this would probably be done by adding devicetree aliases
to the main dtsi file for the lpc32xx and using bus->req_seq instead.

Since we want to have consistent i2c numbering, we cannot force the
bus->req_seq because. If for instance we have 3 buses numbered
from 0 to 2 with i2c0 enabled, i2c1 disabled and i2c2 enabled;
i2c2 can be selected using 'i2c dev 1' and 'i2c dev 2' commands
because a bus can be probed using req_seq or seq interchangeably.

Signed-off-by: Liam Beguin <lbeguin@tycoint.com>
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>

drivers/i2c/lpc32xx_i2c.c

@@ -282,6 +282,7 @@ U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_2, lpc32xx_i2c_init, NULL,
 static int lpc32xx_i2c_probe(struct udevice *bus)
 {
 	struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+	bus->seq = dev->index;
 
 	__i2c_init(dev->base, dev->speed, 0, dev->index);
 	return 0;