Set *pitch in bufmgr_bo_alloc_tiled

Pitch is an out parameter, and the value is used by vaGetImage and
elsewhere.

Change-Id: I7eb7d1fcd095454d81369e1cf7b7a764781391a1
diff --git a/media_driver/linux/common/os/magma/mos_bufmgr_magma.cpp b/media_driver/linux/common/os/magma/mos_bufmgr_magma.cpp
index 8556819..0a3a82b 100644
--- a/media_driver/linux/common/os/magma/mos_bufmgr_magma.cpp
+++ b/media_driver/linux/common/os/magma/mos_bufmgr_magma.cpp
@@ -267,6 +267,8 @@
     uint64_t height = get_height_with_tiling(y, tiling);
     uint64_t size = ROUND_UP_TO(stride * height, 4096);
 
+    *pitch = stride;
+
     MagmaBo* bo = static_cast<MagmaBufMgr*>(bufmgr)->CreateBo(name, size);
 
     if (bo)