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/README b/README
index 9c6d058..53e56bb 100644
--- a/README
+++ b/README
@@ -2058,6 +2058,19 @@
 		  - CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5
 		  - CONFIF_SYS_I2C_SH_NUM_CONTROLLERS for nummber of i2c buses
 
+		- drivers/i2c/omap24xx_i2c.c
+		  - activate this driver with CONFIG_SYS_I2C_OMAP24XX
+		  - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0
+		  - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0
+		  - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1
+		  - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1
+		  - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2
+		  - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2
+		  - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3
+		  - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3
+		  - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4
+		  - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4
+
 		additional defines:
 
 		CONFIG_SYS_NUM_I2C_BUSES