Convert CONFIG_SYS_I2C_OMAP24XX to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_I2C_OMAP24XX

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 8ac1cc6..720e82d 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -145,6 +145,12 @@
 	  channels and operating on standard mode upto 100 kbits/s and fast
 	  mode upto 400 kbits/s.
 
+config SYS_I2C_OMAP24XX
+	bool "TI OMAP2+ I2C driver"
+	depends on ARCH_OMAP2PLUS
+	help
+	  Add support for the OMAP2+ I2C driver.
+
 config SYS_I2C_ROCKCHIP
 	bool "Rockchip I2C driver"
 	depends on DM_I2C