Move libhardware of <asm/page.h>.

Change-Id: I7cf9d04828f19b8d7d1d3b8948bef580b101b10c
diff --git a/modules/gralloc/gr.h b/modules/gralloc/gr.h
index 3a43aa7..732b6bc 100644
--- a/modules/gralloc/gr.h
+++ b/modules/gralloc/gr.h
@@ -18,11 +18,7 @@
 #define GR_H_
 
 #include <stdint.h>
-#ifdef HAVE_ANDROID_OS      // just want PAGE_SIZE define
-# include <asm/page.h>
-#else
-# include <sys/user.h>
-#endif
+#include <sys/user.h>
 #include <limits.h>
 #include <sys/cdefs.h>
 #include <hardware/gralloc.h>