Ok, i rebuilt the kernel locally:

ubuntu@apollo:~$ uname -a
Linux apollo 5.4.0-11-generic #14 SMP Mon Jan 20 12:58:43 UTC 2020 aarch64 
aarch64 aarch64 GNU/Linux

and it works fine here.
Seth mentioned a possible binutils regression, here's what i had installed (and 
what i used to build the kernel):

ubuntu@apollo:~$ dpkg -l | grep binutils
ii  binutils                              2.33.50.20200114-0ubuntu1         
arm64        GNU assembler, linker and binary utilities
ii  binutils-aarch64-linux-gnu            2.33.50.20200114-0ubuntu1         
arm64        GNU binary utilities, for aarch64-linux-gnu target
ii  binutils-common:arm64                 2.33.50.20200114-0ubuntu1         
arm64        Common files for the GNU assembler, linker and binary utilities
ii  libbinutils:arm64                     2.33.50.20200114-0ubuntu1         
arm64        GNU binary utilities (private shared library)

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https://bugs.launchpad.net/bugs/1860144

Title:
  linux 5.4.0-11 fails to boot on arm64

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