UPSTREAM: drivers: nand: brcmnand: add initial support

The driver brcmnand come from linux kernel 4.18.
Only SoC bcm6838 and bcm6858 are supported.

Change-Id: I0337600b164da018c1236ef9cbdd90ecc0904

UPSTREAM: drivers: nand: brcmnand: add initial support

The driver brcmnand come from linux kernel 4.18.
Only SoC bcm6838 and bcm6858 are supported.

Change-Id: I0337600b164da018c1236ef9cbdd90ecc0904ee7
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 22daafba25592b79112d21d1662d7b8381827c56)

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