Convert CONFIG_SYS_OMAP24_I2C_SLAVE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_OMAP24_I2C_SLAVE
   CONFIG_SYS_OMAP24_I2C_SPEED

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/configs/am335x_baltos_defconfig b/configs/am335x_baltos_defconfig
index 548e045..97e6001 100644
--- a/configs/am335x_baltos_defconfig
+++ b/configs/am335x_baltos_defconfig
@@ -47,6 +47,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:128k(SPL),128k(SPL.backup1),128k(SPL.backup2),128k(SPL.backup3),1920k(u-boot),-(UBI)"
 CONFIG_CMD_UBI=y
 CONFIG_ISO_PARTITION=y
+CONFIG_SYS_OMAP24_I2C_SPEED=1000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_NAND=y
 CONFIG_PHYLIB=y
diff --git a/configs/cm_t3517_defconfig b/configs/cm_t3517_defconfig
index fa78bde..c1e1153 100644
--- a/configs/cm_t3517_defconfig
+++ b/configs/cm_t3517_defconfig
@@ -31,6 +31,7 @@
 CONFIG_MTDIDS_DEFAULT="nand0=nand"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=nand:512k(x-loader),1920k(u-boot),256k(u-boot-env),4m(kernel),-(fs)"
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_LED_STATUS=y
 CONFIG_LED_STATUS_GPIO=y
 CONFIG_LED_STATUS0=y
diff --git a/configs/eco5pk_defconfig b/configs/eco5pk_defconfig
index c5b5c9b..c371020 100644
--- a/configs/eco5pk_defconfig
+++ b/configs/eco5pk_defconfig
@@ -26,6 +26,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:512k(xloader-nand),1024k(uboot-nand),256k(params-nand),5120k(kernel),-(ubifs)"
 CONFIG_CMD_UBI=y
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_NAND=y
 CONFIG_SYS_NAND_BUSWIDTH_16BIT=y
diff --git a/configs/kc1_defconfig b/configs/kc1_defconfig
index e828405..b4a5ce6 100644
--- a/configs/kc1_defconfig
+++ b/configs/kc1_defconfig
@@ -34,6 +34,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_ISO_PARTITION=y
 CONFIG_EFI_PARTITION=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
diff --git a/configs/mt_ventoux_defconfig b/configs/mt_ventoux_defconfig
index 3dd8adb..d7e5444 100644
--- a/configs/mt_ventoux_defconfig
+++ b/configs/mt_ventoux_defconfig
@@ -31,6 +31,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:512k(MLO),1m(u-boot),256k(env1),256k(env2),8m(ubisystem),-(rootfs)"
 CONFIG_CMD_UBI=y
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_NAND=y
 CONFIG_SYS_NAND_BUSWIDTH_16BIT=y
diff --git a/configs/sniper_defconfig b/configs/sniper_defconfig
index a3bae56..84ba175 100644
--- a/configs/sniper_defconfig
+++ b/configs/sniper_defconfig
@@ -35,6 +35,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_ISO_PARTITION=y
 CONFIG_EFI_PARTITION=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
diff --git a/configs/twister_defconfig b/configs/twister_defconfig
index 03db9df..f49c234 100644
--- a/configs/twister_defconfig
+++ b/configs/twister_defconfig
@@ -31,6 +31,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:512k(MLO),1m(u-boot),256k(env1),256k(env2),6m(kernel),-(rootfs)"
 CONFIG_CMD_UBI=y
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_OMAP24_I2C_SPEED=400000
 CONFIG_MMC_OMAP_HS=y
 CONFIG_NAND=y
 CONFIG_SYS_NAND_BUSWIDTH_16BIT=y