[Bug 1910555] [NEW] Driver build error on kernel 5.8, but works on 5.4

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Recently kernel was updated on Focal from 5.4 to 5.8. From that moment on WiFi doesn't work anymore. After a try rebuild (reconfigure) the result is:
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# dpkg-reconfigure bcmwl-kernel-source
Removing all DKMS Modules
Done.
Loading new bcmwl-6.30.223.271+bdcom DKMS files...
Building for 5.4.0-59-generic 5.8.0-34-generic
Building for architecture x86_64
Building initial module for 5.4.0-59-generic
Done.

wl.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.4.0-59-generic/updates/dkms/

depmod................

DKMS: install completed.
Building initial module for 5.8.0-34-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/bcmwl-kernel-source.0.crash'
Error! Bad return status for module build on kernel: 5.8.0-34-generic (x86_64)
Consult /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/make.log for more information.
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As could be seen, the build for 5.4 completes successfully (and works on same kernel), but for 5.8 fails. Seems something is going wrong with missing function declaration - function "ioremap_nocache", as could be seen in attached make.log.
I'm guessing, driver code may need be updated according to the new kernel headers.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-59.65-generic 5.4.78
Uname: Linux 5.4.0-59-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Thu Jan  7 17:13:05 2021
InstallationDate: Installed on 2020-06-22 (198 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: bcmwl
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bcmwl (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug focal kqa-blocker patch
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Driver build error on kernel 5.8, but works on 5.4
https://bugs.launchpad.net/bugs/1910555
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