Describe the bug
I used several SC16IS752 on a Pi 4.
After the Last Update, the ttySCx devices are not longer available. After downgrading, the devices are available again. (4.19)
Seems the devices are recognized correct, but the device in /dev/ are not created.
Any Idears?

System
Copy and paste the results of the raspinfo command in to this section. Alternatively, copy and paste a pastebin link, or add answers to the following questions:

• Which model of Raspberry Pi? e.g. Pi3B+, PiZeroW
  PI4
• Which OS and version (cat /etc/rpi-issue)?
  Raspberry Pi reference 2019-07-10
  Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 175dfb027ffabd4b8d5080097af0e51ed9a4a56c, stage5
• Which firmware version (vcgencmd version)?
  Jul 17 2020 10:59:17
  Copyright (c) 2012 Broadcom
  version 21a15cb094f41c7506ad65d2cb9b29c550693057 (clean) (release) (start)
• Which kernel version (uname -a)?
  Linux marine-control-server 5.4.51-v8+ 4.19.97 Booting RPi 4 with rootfs on SSD on USB 3 hub fails firmware#1329 SMP PREEMPT Wed Jul 29 10:33:36 BST 2020 aarch64 GNU/Linux

Logs
-dmesg:
[ 5.551930] serial serial0: tty port ttySC0 registered
[ 5.583411] serial serial1: tty port ttySC1 registered
[ 5.620841] serial serial2: tty port ttySC2 registered
[ 5.626098] serial serial3: tty port ttySC3 registered
[ 5.641702] serial serial4: tty port ttySC4 registered
[ 5.646916] serial serial5: tty port ttySC5 registered

-sudo vcdbg log msg
005693.525: brfs: File read: /mfs/sd/overlays/sc16is752-i2c.dtbo
005744.434: Loaded overlay 'sc16is752-i2c'
005744.463: dtparam: int_pin=13
005744.950: dtparam: addr=0x4c
005745.863: dtparam: xtal=14745600
005893.915: brfs: File read: 1356 bytes
005895.258: brfs: File read: /mfs/sd/overlays/sc16is752-i2c.dtbo
005946.342: Loaded overlay 'sc16is752-i2c'
005946.366: dtparam: int_pin=12
005946.834: dtparam: addr=0x49
005947.744: dtparam: xtal=14745600
006097.264: brfs: File read: 1356 bytes
006098.597: brfs: File read: /mfs/sd/overlays/sc16is752-i2c.dtbo
006149.818: Loaded overlay 'sc16is752-i2c'
006149.841: dtparam: int_pin=6
006150.311: dtparam: addr=0x48
006151.224: dtparam: xtal=14745600

-cat /proc/tty/drivers
unknown /dev/ttySC 235 0-7 serial

Additional context
Add any other relevant context for the problem.