*** This bug is a duplicate of bug 1848790 ***
    https://bugs.launchpad.net/bugs/1848790

About the problem of "there is no /dev/mmcblk0* device", I checked your
dmesg, there are two places are weird

the 1st one is about the raspberrypi-firmware, on my board, the dmesg will show:
[    0.100540] raspberrypi-firmware soc:firmware: Attached to firmware from 
2019-08-15 12:03, variant start
[    0.110122] raspberrypi-firmware soc:firmware: Firmware hash is 
9f8431fb7839c7f00f52b81f5822ddab2b31d0db

And there are not errors about firmware, but your dmesg is different.

the 2nd one is about mmc-bcm2835 driver, your kernel always report:
mmc-bcm2835 fe300000.mmcnr: could not get clk, deferring probe

That is different from my board, on my board, it only reports that
message once, Then the driver could get the clk successfully.

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Packages, which is subscribed to linux-raspi2 in Ubuntu.
https://bugs.launchpad.net/bugs/1848703

Title:
  Raspberry Pi 4 - USB Bus not detecting any devices

Status in linux-raspi2 package in Ubuntu:
  Confirmed

Bug description:
  Pi 4 new install.  System boots up but USB bus is not working.

  Tried 3 keyboards no key presses detected, 2 usb memory drives don't
  show up in lsblk.

  output of $lspci
  00:00.0 PCI bridge: Broadcom Inc. and subsidiaries Device 2711 (rev 10)
  01:00.0 USB controller: VIA Technologies, Inc. VL805 USB 3.0 Host Controller 
(rev 01) 

  output of $dmesg on pastebin here http://pastebin.com/h7A3n9xa or
  attached to this bug report.

  Not the only one experiencing bug.  Another user created a post on the ubuntu 
forums: 
  
https://ubuntuforums.org/showthread.php?t=2429396&s=01a0c4b0cb4c05e605cbf9d41f660e08&p=13898142#post13898142


  64bit raspberry pi 4&4 image pulled from
  https://ubuntu.com/download/iot/raspberry-pi page.  Specifically
  http://cdimage.ubuntu.com/releases/19.10/release/ubuntu-19.10
  -preinstalled-server-arm64+raspi3.img.xz

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