arm: mvebu: turris_omnia: move I2C dependencies to Kconfig

The I2C dependencies are defined in include/configs/turris_omnia.h,
because Turris Omnia won't boot correctly without I2C support.

Move these dependencies to Kconfig, so that they are selected if Turris
Omnia is selected as target.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Reviewed-by: NHeiko Schocher <hs@denx.de>
Reviewed-by: NStefan Roese <sr@denx.de>
Signed-off-by: NStefan Roese <sr@denx.de>

arch/arm/mach-mvebu/Kconfig

@@ -116,6 +116,11 @@ config TARGET_DB_88F6820_AMC
 config TARGET_TURRIS_OMNIA
 	bool "Support Turris Omnia"
 	select 88F6820
+	select DM_I2C
+	select I2C_MUX
+	select I2C_MUX_PCA954x
+	select SPL_I2C_MUX
+	select SYS_I2C_MVTWSI
 
 config TARGET_TURRIS_MOX
 	bool "Support Turris Mox"

include/configs/turris_omnia.h

@@ -18,17 +18,6 @@
  */
 #define CONFIG_SYS_TCLK		250000000	/* 250MHz */
 
-/*
- * Commands configuration
- */
-
-/* I2C support */
-#define CONFIG_DM_I2C
-#define CONFIG_I2C_MUX
-#define CONFIG_I2C_MUX_PCA954x
-#define CONFIG_SPL_I2C_MUX
-#define CONFIG_SYS_I2C_MVTWSI
-
 /* USB/EHCI configuration */
 #define CONFIG_EHCI_IS_TDI