spi: sh-msiof: remove slave_id settings for DMAEngine

Current sh-msiof sets dma_slave_config :: slave_id field for DMAEngine,
but it is no longer needed. Let's remove it.

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Kuninori Morimoto <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/spi/spi-sh-msiof.c

···
 	}
 
 	memset(&cfg, 0, sizeof(cfg));
-	cfg.slave_id = id;
 	cfg.direction = dir;
 	if (dir == DMA_MEM_TO_DEV) {
 		cfg.dst_addr = port_addr;