Update to v6.8 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.8

Test: Builds and bionic unit tests pass on raven.
Test: Able to log in to an Android GO 32 bit device.
Change-Id: I0022cdb20c19726f526acaab2866f1e25794b77e
diff --git a/libc/kernel/uapi/drm/nouveau_drm.h b/libc/kernel/uapi/drm/nouveau_drm.h
index 221ff21..f7d870e 100644
--- a/libc/kernel/uapi/drm/nouveau_drm.h
+++ b/libc/kernel/uapi/drm/nouveau_drm.h
@@ -23,6 +23,8 @@
 #define NOUVEAU_GETPARAM_HAS_BO_USAGE 15
 #define NOUVEAU_GETPARAM_HAS_PAGEFLIP 16
 #define NOUVEAU_GETPARAM_EXEC_PUSH_MAX 17
+#define NOUVEAU_GETPARAM_VRAM_BAR_SIZE 18
+#define NOUVEAU_GETPARAM_VRAM_USED 19
 struct drm_nouveau_getparam {
   __u64 param;
   __u64 value;