Update to v4.19 kernel headers.

Test: Builds and boots.
Change-Id: I99a9ed79666e143b47f02ca4e59eed94f69b7e4a
(cherry picked from commit a981e2e52e2e95a65fa9c9b6fb16dcb4c83dd576)
diff --git a/libc/kernel/uapi/linux/psp-sev.h b/libc/kernel/uapi/linux/psp-sev.h
index 5f59330..10582d4 100644
--- a/libc/kernel/uapi/linux/psp-sev.h
+++ b/libc/kernel/uapi/linux/psp-sev.h
@@ -27,6 +27,7 @@
   SEV_PDH_GEN,
   SEV_PDH_CERT_EXPORT,
   SEV_PEK_CERT_IMPORT,
+  SEV_GET_ID,
   SEV_MAX,
 };
 typedef enum {
@@ -78,6 +79,10 @@
   __u64 cert_chain_address;
   __u32 cert_chain_len;
 } __packed;
+struct sev_user_data_get_id {
+  __u8 socket1[64];
+  __u8 socket2[64];
+} __packed;
 struct sev_issue_cmd {
   __u32 cmd;
   __u64 data;