Try to initialize emmc in board_late_init() and if it fails then we know
that emmc device is not connected.
This allows to use in U-Boot just one DTS file for all Espressobin variants
and also to correctly set fdtfile env variable for Linux kernel.
Signed-off-by: Pali Rohár <pali@kernel.org>
Tested-by: Gérald Kerma <gerald@gk2.net>
Reviewed-by: Andre Heider <a.heider@gmail.com>
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