SAMA5D3-xplained board cleanup question

[Alexander Shiyan]

Hello All!

 I would like to propose a cleanup for the SAMA5D3-xplained board support.
The board currently has code in board.c that configures the
at91sam9-smc (Static Memory Controller).
However, since the board uses devicetree, this configuration should be
handled by the MFD driver
that is responsible for the SMC and is devicetree-based.

Therefore, I think we can remove the SMC configuration from the board file.
But I don't have a SAMA5D3-xplained board to test this change.

Could someone who has access to this board please test the removal of
the SMC configuration?

Thanks!