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/fs.h b/libc/kernel/uapi/linux/fs.h
index 0601768..3bb4183 100644
--- a/libc/kernel/uapi/linux/fs.h
+++ b/libc/kernel/uapi/linux/fs.h
@@ -129,6 +129,7 @@
 #define BLKSECDISCARD _IO(0x12, 125)
 #define BLKROTATIONAL _IO(0x12, 126)
 #define BLKZEROOUT _IO(0x12, 127)
+#define BLKGETDISKSEQ _IOR(0x12, 128, __u64)
 #define BMAP_IOCTL 1
 #define FIBMAP _IO(0x00, 1)
 #define FIGETBSZ _IO(0x00, 2)