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>

arch/microblaze/include/asm/pgtable.h

@@ -572,7 +572,7 @@ void __init *early_get_page(void);
 
 extern unsigned long ioremap_bot, ioremap_base;
 
-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);
 void consistent_free(size_t size, void *vaddr);
 void consistent_sync(void *vaddr, size_t size, int direction);
 void consistent_sync_page(struct page *page, unsigned long offset,

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;