Make mips/mips64 syscall stubs more like the other architectures.

Change-Id: I55f8c1a95f643a6e484f12fbcc25e2c77e55b6b8

libc/arch-mips64/syscalls/__epoll_pwait.S

@@ -1,14 +1,8 @@
 /* Generated by gensyscalls.py. Do not edit. */
 
-#include <asm/unistd.h>
-#include <machine/asm.h>
-#include <machine/regdef.h>
-    .text
-    .globl __epoll_pwait
-    .align 4
-    .ent __epoll_pwait
+#include <private/bionic_asm.h>
 
-__epoll_pwait:
+ENTRY(__epoll_pwait)
     .set push
     .set noreorder
     li v0, __NR_epoll_pwait
@@ -28,5 +22,5 @@ __epoll_pwait:
     j t9
     move ra, t0
     .set pop
-    .end __epoll_pwait
+END(__epoll_pwait)
 .hidden _C_LABEL(__epoll_pwait)