libgralloc: include <sys/ioctl.h>

- In ionalloc.cpp, include <sys/ioctl.h> instead of <linux/ioctl.h>, in
  the similar way as other HAL libraries are including.
- Helps in resolving compilation warnings

Change-Id: I9068e1e2dd97ce580aeecc25f611900127502fc7
diff --git a/libgralloc/ionalloc.cpp b/libgralloc/ionalloc.cpp
index 311fd8f..bb6c2c8 100644
--- a/libgralloc/ionalloc.cpp
+++ b/libgralloc/ionalloc.cpp
@@ -28,7 +28,7 @@
  */
 
 #define DEBUG 0
-#include <linux/ioctl.h>
+#include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <stdlib.h>
 #include <fcntl.h>