[PATCH] drm/i915: fix header file inclusion for might_alloc()

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

Replace "linux/slab.h" with "linux/sched/mm.h" header inclusion
as the first is not required, while the second, if not included,
prdouces the following error:

drivers/gpu/drm/i915/i915_vma_resource.c: In function ‘i915_vma_resource_bind_dep_await’:
drivers/gpu/drm/i915/i915_vma_resource.c:381:9: error: implicit declaration of function ‘might_alloc’; did you mean ‘might_lock’? [-Werror=implicit-function-declaration]
  381 |         might_alloc(gfp);
      |         ^~~~~~~~~~~
      |         might_lock

Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_vma_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_vma_resource.c b/drivers/gpu/drm/i915/i915_vma_resource.c
index 1f41c0c699eb..bbb0ff14272f 100644
--- a/drivers/gpu/drm/i915/i915_vma_resource.c
+++ b/drivers/gpu/drm/i915/i915_vma_resource.c
@@ -4,7 +4,7 @@
  */
 
 #include <linux/interval_tree_generic.h>
-#include <linux/slab.h>
+#include <linux/sched/mm.h>
 
 #include "i915_sw_fence.h"
 #include "i915_vma_resource.h"
-- 
2.34.1