powerpc: Non relocatable system call doesn't need a trampoline

We need to use a trampoline when using LOAD_HANDLER(), because the
destination needs to be in the first 64kB. An absolute branch has
no such limitations, so just jump there.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/exceptions-64s.S

@@ -79,7 +79,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)				\
 	mfspr	r12,SPRN_SRR1 ;					\
 	li	r10,MSR_RI ;					\
 	mtmsrd 	r10,1 ;			/* Set RI (EE=0) */	\
-	b	system_call_entry ;
+	b	system_call_common ;
 #endif
 
 /*