powerpc: Use standard macros for sys_sigpending() & sys_old_getrlimit()

Currently we have sys_sigpending and sys_old_getrlimit defined to use
COMPAT_SYS() in systbl.h, but then both are #defined to sys_ni_syscall
in systbl.S.

This seems to have been done when ppc and ppc64 were merged, in commit
9994a338 "Introduce entry_{32,64}.S, misc_{32,64}.S, systbl.S".

AFAICS there's no longer (or never was) any need for this, we can just
use SYSX() for both and remove the #defines to sys_ni_syscall.

The expansion before was:

  #define COMPAT_SYS(func)	.llong	.sys_##func,.compat_sys_##func
  #define sys_old_getrlimit sys_ni_syscall
  COMPAT_SYS(old_getrlimit)
  =>
  .llong	.sys_old_getrlimit,.compat_sys_old_getrlimit
  =>
  .llong	.sys_ni_syscall,.compat_sys_old_getrlimit

After is:

  #define SYSX(f, f3264, f32)	.llong	.f,.f3264
  SYSX(sys_ni_syscall, compat_sys_old_getrlimit, sys_old_getrlimit)
  =>
  .llong	.sys_ni_syscall,.compat_sys_old_getrlimit

ie. they are equivalent.

Finally both COMPAT_SYS() and SYSX() evaluate to sys_ni_syscall in the
Cell SPU code.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/systbl.h

@@ -77,10 +77,10 @@ SYSCALL_SPU(setreuid)
 SYSCALL_SPU(setregid)
 #define compat_sys_sigsuspend sys_sigsuspend
 SYS32ONLY(sigsuspend)
-COMPAT_SYS(sigpending)
+SYSX(sys_ni_syscall,compat_sys_sigpending,sys_sigpending)
 SYSCALL_SPU(sethostname)
 COMPAT_SYS_SPU(setrlimit)
-COMPAT_SYS(old_getrlimit)
+SYSX(sys_ni_syscall,compat_sys_old_getrlimit,sys_old_getrlimit)
 COMPAT_SYS_SPU(getrusage)
 COMPAT_SYS_SPU(gettimeofday)
 COMPAT_SYS_SPU(settimeofday)

arch/powerpc/kernel/systbl.S

@@ -39,9 +39,6 @@
 .section .rodata,"a"
 
 #ifdef CONFIG_PPC64
-#define sys_sigpending	sys_ni_syscall
-#define sys_old_getrlimit sys_ni_syscall
-
 	.p2align	3
 #endif