Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
Merged-In: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/drm/vmwgfx_drm.h b/libc/kernel/uapi/drm/vmwgfx_drm.h
index bb1f36d..753192b 100644
--- a/libc/kernel/uapi/drm/vmwgfx_drm.h
+++ b/libc/kernel/uapi/drm/vmwgfx_drm.h
@@ -266,7 +266,8 @@
 enum drm_vmw_surface_flags {
   drm_vmw_surface_flag_shareable = (1 << 0),
   drm_vmw_surface_flag_scanout = (1 << 1),
-  drm_vmw_surface_flag_create_buffer = (1 << 2)
+  drm_vmw_surface_flag_create_buffer = (1 << 2),
+  drm_vmw_surface_flag_coherent = (1 << 3),
 };
 struct drm_vmw_gb_surface_create_req {
   __u32 svga3d_flags;