mfd: Explicitely include slab.h to rtsx
This fixes the following build error on some architectures (parisc at least):
drivers/mfd/rtsx_pcr.c: In function 'rtsx_pci_init_chip':
drivers/mfd/rtsx_pcr.c:985:2: error: implicit declaration of function 'kcalloc'
[-Werror=implicit-function-declaration]
drivers/mfd/rtsx_pcr.c:985:13: warning: assignment makes pointer from integer
without a cast [enabled by default]
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
index 56d4377..3a44efa 100644
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -22,6 +22,7 @@
#include <linux/pci.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>