Update to v5.13 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.13

Test: Builds, bionic unit tests.
Change-Id: Ia4360ca4a2808206f64187dcb234d73c5752624b
diff --git a/libc/kernel/uapi/asm-arm/asm/setup.h b/libc/kernel/uapi/asm-arm/asm/setup.h
index b4da2d1..672a72a 100644
--- a/libc/kernel/uapi/asm-arm/asm/setup.h
+++ b/libc/kernel/uapi/asm-arm/asm/setup.h
@@ -19,7 +19,7 @@
 #ifndef _UAPI__ASMARM_SETUP_H
 #define _UAPI__ASMARM_SETUP_H
 #include <linux/types.h>
-#define COMMAND_LINE_SIZE 2048
+#define COMMAND_LINE_SIZE 1024
 #define ATAG_NONE 0x00000000
 struct tag_header {
   __u32 size;