Update to v5.11 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.11

Test: Built cuttlefish and flame images. Ran bionic unit tests on both.
Change-Id: Ie60337aafad4bda55af99b6c8fe9f56bf2fa787f
diff --git a/libc/kernel/uapi/asm-generic/siginfo.h b/libc/kernel/uapi/asm-generic/siginfo.h
index 16a85c3..8bcbabb 100644
--- a/libc/kernel/uapi/asm-generic/siginfo.h
+++ b/libc/kernel/uapi/asm-generic/siginfo.h
@@ -209,7 +209,8 @@
 #define POLL_HUP 6
 #define NSIGPOLL 6
 #define SYS_SECCOMP 1
-#define NSIGSYS 1
+#define SYS_USER_DISPATCH 2
+#define NSIGSYS 2
 #define EMT_TAGOVF 1
 #define NSIGEMT 1
 #define SIGEV_SIGNAL 0
diff --git a/libc/kernel/uapi/asm-generic/signal-defs.h b/libc/kernel/uapi/asm-generic/signal-defs.h
index a6de2e4..c7e9504 100644
--- a/libc/kernel/uapi/asm-generic/signal-defs.h
+++ b/libc/kernel/uapi/asm-generic/signal-defs.h
@@ -19,6 +19,31 @@
 #ifndef __ASM_GENERIC_SIGNAL_DEFS_H
 #define __ASM_GENERIC_SIGNAL_DEFS_H
 #include <linux/compiler.h>
+#ifndef SA_NOCLDSTOP
+#define SA_NOCLDSTOP 0x00000001
+#endif
+#ifndef SA_NOCLDWAIT
+#define SA_NOCLDWAIT 0x00000002
+#endif
+#ifndef SA_SIGINFO
+#define SA_SIGINFO 0x00000004
+#endif
+#define SA_UNSUPPORTED 0x00000400
+#define SA_EXPOSE_TAGBITS 0x00000800
+#ifndef SA_ONSTACK
+#define SA_ONSTACK 0x08000000
+#endif
+#ifndef SA_RESTART
+#define SA_RESTART 0x10000000
+#endif
+#ifndef SA_NODEFER
+#define SA_NODEFER 0x40000000
+#endif
+#ifndef SA_RESETHAND
+#define SA_RESETHAND 0x80000000
+#endif
+#define SA_NOMASK SA_NODEFER
+#define SA_ONESHOT SA_RESETHAND
 #ifndef SIG_BLOCK
 #define SIG_BLOCK 0
 #endif
diff --git a/libc/kernel/uapi/asm-generic/signal.h b/libc/kernel/uapi/asm-generic/signal.h
index 1210cbc..874fece 100644
--- a/libc/kernel/uapi/asm-generic/signal.h
+++ b/libc/kernel/uapi/asm-generic/signal.h
@@ -60,15 +60,6 @@
 #ifndef __SIGRTMAX
 #define __SIGRTMAX _KERNEL__NSIG
 #endif
-#define SA_NOCLDSTOP 0x00000001
-#define SA_NOCLDWAIT 0x00000002
-#define SA_SIGINFO 0x00000004
-#define SA_ONSTACK 0x08000000
-#define SA_RESTART 0x10000000
-#define SA_NODEFER 0x40000000
-#define SA_RESETHAND 0x80000000
-#define SA_NOMASK SA_NODEFER
-#define SA_ONESHOT SA_RESETHAND
 #if !defined(MINSIGSTKSZ) || !defined(SIGSTKSZ)
 #define MINSIGSTKSZ 2048
 #define SIGSTKSZ 8192
diff --git a/libc/kernel/uapi/asm-generic/socket.h b/libc/kernel/uapi/asm-generic/socket.h
index 11557aa..7372be8 100644
--- a/libc/kernel/uapi/asm-generic/socket.h
+++ b/libc/kernel/uapi/asm-generic/socket.h
@@ -95,6 +95,8 @@
 #define SO_RCVTIMEO_NEW 66
 #define SO_SNDTIMEO_NEW 67
 #define SO_DETACH_REUSEPORT_BPF 68
+#define SO_PREFER_BUSY_POLL 69
+#define SO_BUSY_POLL_BUDGET 70
 #if __BITS_PER_LONG == 64 || defined(__x86_64__) && defined(__ILP32__)
 #define SO_TIMESTAMP SO_TIMESTAMP_OLD
 #define SO_TIMESTAMPNS SO_TIMESTAMPNS_OLD
diff --git a/libc/kernel/uapi/asm-generic/unistd.h b/libc/kernel/uapi/asm-generic/unistd.h
index 412e751..f284254 100644
--- a/libc/kernel/uapi/asm-generic/unistd.h
+++ b/libc/kernel/uapi/asm-generic/unistd.h
@@ -401,8 +401,9 @@
 #define __NR_pidfd_getfd 438
 #define __NR_faccessat2 439
 #define __NR_process_madvise 440
+#define __NR_epoll_pwait2 441
 #undef __NR_syscalls
-#define __NR_syscalls 441
+#define __NR_syscalls 442
 #if __BITS_PER_LONG == 64 && !defined(__SYSCALL_COMPAT)
 #define __NR_fcntl __NR3264_fcntl
 #define __NR_statfs __NR3264_statfs