Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/scsi/cxlflash_ioctl.h b/libc/kernel/uapi/scsi/cxlflash_ioctl.h
index 9cde93a..91ffe62 100644
--- a/libc/kernel/uapi/scsi/cxlflash_ioctl.h
+++ b/libc/kernel/uapi/scsi/cxlflash_ioctl.h
@@ -28,6 +28,7 @@
 };
 #define DK_CXLFLASH_ALL_PORTS_ACTIVE 0x0000000000000001ULL
 #define DK_CXLFLASH_APP_CLOSE_ADAP_FD 0x0000000000000002ULL
+#define DK_CXLFLASH_CONTEXT_SQ_CMD_MODE 0x0000000000000004ULL
 #define DK_CXLFLASH_ATTACH_REUSE_CONTEXT 0x8000000000000000ULL
 struct dk_cxlflash_attach {
   struct dk_cxlflash_hdr hdr;