powerpc: Remove CONFIG_POWER4_ONLY

Remove CONFIG_POWER4_ONLY, the option is badly named and only does two
things:

- It wraps the MMU segment table code. With feature fixups there is
  little downside to compiling this in.

- It uses the newer mtocrf instruction in various assembly functions.
  Instead of making this a compile option just do it at runtime via
  a feature fixup.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/lib/copyuser_64.S

@@ -30,7 +30,7 @@ _GLOBAL(__copy_tofrom_user_base)
 	dcbt	0,r4
 	beq	.Lcopy_page_4K
 	andi.	r6,r6,7
-	PPC_MTOCRF	0x01,r5
+	PPC_MTOCRF(0x01,r5)
 	blt	cr1,.Lshort_copy
 /* Below we want to nop out the bne if we're on a CPU that has the
  * CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
@@ -186,7 +186,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
 	blr
 
 .Ldst_unaligned:
-	PPC_MTOCRF	0x01,r6		/* put #bytes to 8B bdry into cr7 */
+	PPC_MTOCRF(0x01,r6)		/* put #bytes to 8B bdry into cr7 */
 	subf	r5,r6,r5
 	li	r7,0
 	cmpldi	cr1,r5,16
@@ -201,7 +201,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
 2:	bf	cr7*4+1,3f
 37:	lwzx	r0,r7,r4
 83:	stwx	r0,r7,r3
-3:	PPC_MTOCRF	0x01,r5
+3:	PPC_MTOCRF(0x01,r5)
 	add	r4,r6,r4
 	add	r3,r6,r3
 	b	.Ldst_aligned