i2c, omap24xx: convert driver to new mutlibus/mutliadapter framework

- add omap24xx driver to new multibus/multiadpater support
- adapted all config files, which uses this driver

Tested on the am335x based siemens boards rut, dxr2 and pxm2
posted here:
http://patchwork.ozlabs.org/patch/263211/

Signed-off-by: Heiko Schocher <hs@denx.de>
Tested-by: Tom Rini <trini@ti.com>
Cc: Lars Poeschel <poeschel@lemonage.de>
Cc: Steve Sakoman <sakoman@gmail.com>
Cc: Thomas Weber <weber@corscience.de>
Cc: Tom Rix <Tom.Rix@windriver.com>
Cc: Grazvydas Ignotas <notasas@gmail.com>
Cc: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Cc: Luca Ceresoli <luca.ceresoli@comelit.it>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Ilya Yanok <yanok@emcraft.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Nishanth Menon <nm@ti.com>
Cc: Pali Rohár <pali.rohar@gmail.com>
Cc: Peter Barada <peter.barada@logicpd.com>
Cc: Nagendra T S  <nagendra@mistralsolutions.com>
Cc: Michael Jones <michael.jones@matrix-vision.de>
Cc: Raphael Assenat <raph@8d.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/siemens/common/board.c b/board/siemens/common/board.c
index 6279c32..32d2ee4 100644
--- a/board/siemens/common/board.c
+++ b/board/siemens/common/board.c
@@ -42,7 +42,7 @@
 {
 	/* Initalize the board header */
 	enable_i2c0_pin_mux();
-	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+	i2c_set_bus_num(0);
 	if (read_eeprom() < 0)
 		puts("Could not get board ID.\n");
 
@@ -67,7 +67,7 @@
 #if defined(CONFIG_HW_WATCHDOG)
 	hw_watchdog_init();
 #endif /* defined(CONFIG_HW_WATCHDOG) */
-	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+	i2c_set_bus_num(0);
 	if (read_eeprom() < 0)
 		puts("Could not get board ID.\n");