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/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 013586e..89c91d1 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -22,6 +22,7 @@
 	imply SPL_NAND_SUPPORT
 	imply SPL_POWER_SUPPORT
 	imply SPL_SERIAL_SUPPORT
+	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 	imply TWL4030_POWER
 
@@ -40,6 +41,7 @@
 	imply SPL_NAND_SUPPORT
 	imply SPL_POWER_SUPPORT
 	imply SPL_SERIAL_SUPPORT
+	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 
 config OMAP54XX
@@ -59,6 +61,7 @@
 	imply SPL_NAND_SUPPORT
 	imply SPL_POWER_SUPPORT
 	imply SPL_SERIAL_SUPPORT
+	imply SYS_I2C_OMAP24XX
 
 config TI814X
 	bool "TI814X SoC"
@@ -82,6 +85,7 @@
 	imply SPL_OF_TRANSLATE
 	imply SPL_SEPARATE_BSS
 	imply SPL_SYS_MALLOC_SIMPLE
+	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 	help
 	  Support for AM43xx SOC from Texas Instruments.
@@ -92,6 +96,7 @@
 
 config AM33XX
 	bool "AM33XX SoC"
+	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 	imply USE_TINY_PRINTF
 	help