cputlb: drop flush_global flag from tlb_flush

We have never has the concept of global TLB entries which would avoid
the flush so we never actually use this flag. Drop it and make clear
that tlb_flush is the sledge-hammer it has always been.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
[DG: ppc portions]
Acked-by: David Gibson <david@gibson.dropbear.id.au>

target/openrisc/interrupt_helper.c

@@ -53,7 +53,7 @@ void HELPER(rfe)(CPUOpenRISCState *env)
     }
 
     if (need_flush_tlb) {
-        tlb_flush(cs, 1);
+        tlb_flush(cs);
     }
 #endif
     cs->interrupt_request |= CPU_INTERRUPT_EXITTB;