settings: display actual device peak refresh rate in summary

The hardcoded value of 90Hz might be incorrect for some devices.

Squashed with:
Author: Michael W <baddaemon87@gmail.com>
Date:   Thu Oct 14 19:22:29 2021 +0200

    Fixup "settings: display actual device peak refresh rate in summary"

    This partially reverts commit 892841cc.

    * peak_refresh_rate_summary ->
      peak_refresh_rate_summary_custom

    Change-Id: I11140715990215329a0813a232651bfbd230828d

Change-Id: I6074f081855f20f8c4b973e893175d9b0f79b3ab