lib/genalloc.c: include vmalloc.h

Fixes build break on most ARM/ARM64 defconfigs:

  lib/genalloc.c: In function 'gen_pool_add_virt':
  lib/genalloc.c:190:10: error: implicit declaration of function 'vzalloc_node'; did you mean 'kzalloc_node'?
  lib/genalloc.c:190:8: warning: assignment to 'struct gen_pool_chunk *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  lib/genalloc.c: In function 'gen_pool_destroy':
  lib/genalloc.c:254:3: error: implicit declaration of function 'vfree'; did you mean 'kfree'?

Fixes: 6862d2f ('lib/genalloc.c: use vzalloc_node() to allocate the bitmap')
Cc: Huang Shijie <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Alexey Skidanov <[email protected]>
Signed-off-by: Olof Johansson <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

lib/genalloc.c

@@ -35,6 +35,7 @@
 #include <linux/interrupt.h>
 #include <linux/genalloc.h>
 #include <linux/of_device.h>
+#include <linux/vmalloc.h>
 
 static inline size_t chunk_size(const struct gen_pool_chunk *chunk)
 {