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: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index f99bd3b..2bf829d 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -116,6 +116,11 @@
 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"