staging: slicoss: fix different address space warnings

Remove incorrect __iomem annotation.

This patch fix the following sparse warnings in slicoss driver:
warning: incorrect type in assignment (different address spaces)
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/slicoss/slic.h

@@ -380,7 +380,7 @@ struct slic_shmemory {
 	dma_addr_t isr_phaddr;
 	dma_addr_t lnkstatus_phaddr;
 	dma_addr_t stats_phaddr;
-	struct slic_shmem_data __iomem *shmem_data;
+	struct slic_shmem_data *shmem_data;
 };
 
 struct slic_upr {