Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/asm-mips/asm/inst.h b/libc/kernel/uapi/asm-mips/asm/inst.h
index 6bf1f69..46a65e6 100644
--- a/libc/kernel/uapi/asm-mips/asm/inst.h
+++ b/libc/kernel/uapi/asm-mips/asm/inst.h
@@ -315,6 +315,7 @@
   rfe_op = 0x10,
   eret_op = 0x18,
   wait_op = 0x20,
+  hypcall_op = 0x28
 };
 enum cop0_com_func {
   tlbr1_op = 0x01,