microblaze: Fix sparse warning - consistent_alloc function

Warning in dma.c was caused by incorrect type in consistent_alloc function.

Warning log:
CHECK   arch/microblaze/kernel/dma.c
arch/microblaze/kernel/dma.c:53:26: warning: incorrect type in argument 1 (different base types)
arch/microblaze/kernel/dma.c:53:26:    expected int [signed] gfp
arch/microblaze/kernel/dma.c:53:26:    got restricted unsigned int [usertype] flag

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c
index 5a59dad..a1e2e18 100644
--- a/arch/microblaze/mm/consistent.c
+++ b/arch/microblaze/mm/consistent.c
@@ -59,7 +59,7 @@
  * uncached region.  This will no doubt cause big problems if memory allocated
  * here is not also freed properly. -- JW
  */
-void *consistent_alloc(int gfp, size_t size, dma_addr_t *dma_handle)
+void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *dma_handle)
 {
 	unsigned long order, vaddr;
 	void *ret;