Move Kconfig sourcing to top level as conceptually it does not make
much sense to source it from a particular board especially as sourcing
it multiple time is completely discouraged as it would lead to the
following warning message:
board/toradex/common/Kconfig:29:warning: choice value used outside its
choice group
board/toradex/common/Kconfig:32:warning: choice value used outside its
choice group
source "board/timll/devkit3250/Kconfig"
source "board/toradex/colibri_pxa270/Kconfig"
source "board/toradex/colibri_vf/Kconfig"
+source "board/toradex/common/Kconfig"
source "board/tqc/tqma6/Kconfig"
source "board/trizepsiv/Kconfig"
source "board/ttcontrol/vision2/Kconfig"
config TRDX_CFG_BLOCK_2ND_ETHADDR
default y
-source "board/toradex/common/Kconfig"
endif