arm: mvebu: turris_omnia: Move CONFIG_SPL_DRIVERS_MISC to Kconfig

Instead of declaring CONFIG_SPL_DRIVERS_MISC in board config header,
select it in Kconfig.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 8365305..c66dab6 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -127,6 +127,7 @@
 	select DM_I2C
 	select I2C_MUX
 	select I2C_MUX_PCA954x
+	select SPL_DRIVERS_MISC
 	select SPL_I2C_MUX
 	select SPL_SYS_MALLOC_SIMPLE
 	select SYS_I2C_MVTWSI