dmaengine: sdxi: device: Include <linux/slab.h>

Signed-off-by: Nathan Lynch <nathan.lynch@amd.com>

Author: nathanlynch

drivers/dma/sdxi/device.c

@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 #include <linux/xarray.h>
 #include <asm/mmu.h>