spi: kirkwood_spi.c: Make global variable static
Signed-off-by: NStefan Roese <sr@denx.de> Acked-by: NPrafulla Wadaskar <prafulla@marvell.com> Tested-by: NLuka Perkov <luka@openwrt.org> Reviewed-by: NJagannadha Sutradharudu Teki <jaganna@xilinx.com>
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