Update to v5.15 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.15

Test: Builds, and ran bionic unit tests on flame.
Change-Id: I86901ea6d89fb0f7384b90a47bef35d194083c24
diff --git a/libc/kernel/uapi/linux/cxl_mem.h b/libc/kernel/uapi/linux/cxl_mem.h
index 2deb45e..15e9e29 100644
--- a/libc/kernel/uapi/linux/cxl_mem.h
+++ b/libc/kernel/uapi/linux/cxl_mem.h
@@ -30,7 +30,7 @@
 #define ___C(a,b) { b }
 static const struct {
   const char * name;
-} cxl_command_names[] = {
+} cxl_command_names[] __attribute__((__unused__)) = {
   CXL_CMDS
 };
 #undef ___C