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PXs3 reference board has 2 spi connectors. This enables spi0 and spi1,
and adds aliases properties for each spi to determine device name
assignments.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>