Update to v4.20.1 kernel headers.

This includes one manual change:

In the file bionic/libc/kernel/uapi/linux/in.h, the macro IN_BADCLASS
was not definied correctly. Change the macro from:

  #define IN_BADCLASS(a) ((((long int) (a)) == 0xffffffff)

to:

  #define IN_BADCLASS(a) (((long int) (a)) == (long int)0xffffffff)

This change is being pushed to the upstream kernels.

Test: Builds and boots.
Change-Id: Ia304773a9dc6789b34d9769d73742384d6afb571
Merged-In: Ia304773a9dc6789b34d9769d73742384d6afb571
(cherry picked from commit 967fb01cce73591281e7804e2c0fa9f83b618f5b)
diff --git a/libc/kernel/uapi/drm/i915_drm.h b/libc/kernel/uapi/drm/i915_drm.h
index 53d1548..89fa529 100644
--- a/libc/kernel/uapi/drm/i915_drm.h
+++ b/libc/kernel/uapi/drm/i915_drm.h
@@ -335,6 +335,7 @@
 #define I915_PARAM_HAS_EXEC_FENCE_ARRAY 49
 #define I915_PARAM_HAS_CONTEXT_ISOLATION 50
 #define I915_PARAM_CS_TIMESTAMP_FREQUENCY 51
+#define I915_PARAM_MMAP_GTT_COHERENT 52
 typedef struct drm_i915_getparam {
   __s32 param;
   int __user * value;