tcg: Remove TCG_TARGET_TLB_DISPLACEMENT_BITS

The last use was removed by e77c89fb086a.

Fixes: e77c89fb086a ("cputlb: Remove static tlb sizing")
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
9 files changed