translate-all: remove tb_lock mention from cpu_restore_state_from_tb

tb_lock was needed when the function did retranslation. However,
since fca8a500 ("tcg: Save insn data and use it in
cpu_restore_state_from_tb") we don't do retranslation.

Get rid of the comment.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

accel/tcg/translate-all.c

@@ -355,7 +355,6 @@ static int encode_search(TranslationBlock *tb, uint8_t *block)
 }
 
 /* The cpu state corresponding to 'searched_pc' is restored.
- * Called with tb_lock held.
  * When reset_icount is true, current TB will be interrupted and
  * icount should be recalculated.
  */