Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/asm-mips/asm/inst.h b/libc/kernel/uapi/asm-mips/asm/inst.h
index 61fa3d6..090a40b 100644
--- a/libc/kernel/uapi/asm-mips/asm/inst.h
+++ b/libc/kernel/uapi/asm-mips/asm/inst.h
@@ -549,8 +549,9 @@
   mm_ext_op = 0x02c,
   mm_pool32axf_op = 0x03c,
   mm_srl32_op = 0x040,
+  mm_srlv32_op = 0x050,
   mm_sra_op = 0x080,
-  mm_srlv32_op = 0x090,
+  mm_srav_op = 0x090,
   mm_rotr_op = 0x0c0,
   mm_lwxs_op = 0x118,
   mm_addu32_op = 0x150,