powerpc/8xx: No need to restore registers and save them again.

In DTLBError handler there is not need to restore r10, r11 and cr registers
after fixing DAR as they are saved again to the same place just after.
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/kernel/head_8xx.S

@@ -481,8 +481,8 @@ DataTLBError:
 	cmpwi	cr0, r11, 0x00f0
 	beq-	FixupDAR	/* must be a buggy dcbX, icbi insn. */
 DARFixed:/* Return from dcbx instruction bug workaround */
-	EXCEPTION_EPILOG_0
-	EXCEPTION_PROLOG
+	EXCEPTION_PROLOG_1
+	EXCEPTION_PROLOG_2
 	mfspr	r10,SPRN_DSISR
 	stw	r10,_DSISR(r11)
 	mr	r5,r10