Keyguard: Add option to scramble pin layout when unlocking (2/2).

Adapted to Lineage SDK and squashed with the following changes:

  From: Adnan Begovic <adnan@cyngn.com>
  Date: Wed, 05 Aug 2015 10:40:41 -0700

      Keyguard: Don't disable visibility when scrambling pin.

        Otherwise the first numbers text is flipped to invisible
        even though it shouldn't be.

      Change-Id: Ia2b80d594e7f11af7a60a85bdb4ea9909d0ac20b

  From: Adnan Begovic <adnan@cyngn.com>
  Date: Wed, 05 Aug 2015 16:21:27 -0700

      Keyguard: Fix scramblepin logic.

      Change-Id: I71e6d26e853fa7bfaeea4b3256902881ac7f74fc

  From: LuK1337 <priv.luk@gmail.com>
  Date: Sat Apr 24 18:14:46 2021 +0200

      Keyguard: Fix mapping mismatch between KeyEvent and NumPadKey

      Change-Id: Ida28a4f037c2f3fa843ac136779e026020d711db

  From: Tommy Webb <tommy@calyxinstitute.org>
  Date: 2023-03-20 14:15:05 -0400

      Fix issue introduced with 13 QPR2 in which the PIN layout is not
      randomized every time the PIN entry view appears.

      Issue: calyxos#1557
      Change-Id: I44247941a02c95cc2ec53fc42ddb1337b61f692e

Original-Change-Id: Ibe8611eb0b8a5bd9275bc96682d2cbafaa37d8f5
Change-Id: I6716b1c76b69d51bd1457ce07de2274541fca1e8