board: verdin-imx8mm: add call to ft_common_board_setup

board: verdin-imx8mm: add call to ft_common_board_setup

With this call the following attributes get set to the device-tree
and are then accessible from linux in /proc/device-tree/

serial-number: The serial number that is stored in config-block
toradex,board-rev: The version of the module (e.g. V1.1A)
toradex,product-id: The SKU number of the module running

Fixes: commit 14d5aeff776b ("board: toradex: Add Verdin iMX8M Mini support")
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>