Convert CONFIG_SYS_I2C_MXC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_I2C_MXC
   CONFIG_SYS_I2C_MXC_I2C1
   CONFIG_SYS_I2C_MXC_I2C2
   CONFIG_SYS_I2C_MXC_I2C3
   CONFIG_SYS_I2C_MXC_I2C4

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2d59562..695c753 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -797,6 +797,7 @@
 	select SYS_FSL_HAS_SEC if IMX_HAB
 	select SYS_FSL_SEC_COMPAT_4
 	select SYS_FSL_SEC_LE
+	select SYS_I2C_MXC
 	select DM
 	select SUPPORT_SPL
 	imply CMD_DM