Update to v5.12 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.12

Test: Boots flame device and runs bionic unit tests.
Test: Boots acloud device and runs bionic unit tests.

Change-Id: I8ac107ce9d4978be3ef9517b90ad6ecafd06785a
diff --git a/libc/kernel/uapi/linux/binfmts.h b/libc/kernel/uapi/linux/binfmts.h
index 8c4fed0..053be3c 100644
--- a/libc/kernel/uapi/linux/binfmts.h
+++ b/libc/kernel/uapi/linux/binfmts.h
@@ -23,4 +23,6 @@
 #define MAX_ARG_STRLEN (PAGE_SIZE * 32)
 #define MAX_ARG_STRINGS 0x7FFFFFFF
 #define BINPRM_BUF_SIZE 256
+#define AT_FLAGS_PRESERVE_ARGV0_BIT 0
+#define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
 #endif