Updated commits to include only necessary changes backported from
upstream backport-iwlwifi, mainline kernel, and backports project.

Need review & submit.

** Description changed:

  [SRU Justifcation]
  
  [Impact]
- When compiled against linux-oem-5.6 kernels on Focal, backport-iwlwifi-dkms 
gives numerous errors and fails the installation. Although the current version 
8324 has been marked obsoleted by 5.4 or newer in bug 1863583 and bug 1869587, 
this still happens during the installation of either kernel headers packages or 
backport-iwlwifi-dkms because dkms will still build but skip installing dkms 
modules. So far this doesn't bring critical errors, but as a LTS series Focal 
will receive more and more kernel version bumps as Bionic does, such build 
failure will be a problem that can't be avoid.
+ When compiled against linux-oem-5.6/linux-5.8 kernels on Focal, 
backport-iwlwifi-dkms gives numerous errors due to in kernel interface changes 
and fails the installation.
  
  [Fix]
- This backports rev 8613, which fixed compilation against v5.8, that is 
already in Groovy to Focal along with necessary changes (Depends: flex, bison).
+ This backports several patches from upstream backport-iwlwifi, mainline 
kernel, and backports project.
  
  [Test Case]
- Tested on 5.4.0-40-generic and 5.6.0-1018-oem on Focal.
+ Tested build on 5.4.0-52-generic, 5.6.0-1032-oem and 5.8.0-25-generic on 
Focal. Since the current version 8324 has been marked obsoleted by 5.4 or newer 
in bug 1863583 and bug 1869587, built modules are not installed currently so no 
runtime tests are required.
  
  [Regression Potential]
  Low. So far backport-iwlwifi-dkms is still marked OBSOLETED_BY=5.4.0, so it 
has totally no effect in the runtime system. This will only change when future 
enablements based on LTS series Focal that relies on out-of-tree driver support 
from this package.
  
  === Original Bug Description ===
  
  Testing failed on:
      amd64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy-canonical-kernel-team-bootstrap/groovy/amd64/b/backport-iwlwifi-dkms/20200619_205606_7a677@/log.gz
      arm64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy-canonical-kernel-team-bootstrap/groovy/arm64/b/backport-iwlwifi-dkms/20200619_210720_cf76d@/log.gz
      ppc64el: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy-canonical-kernel-team-bootstrap/groovy/ppc64el/b/backport-iwlwifi-dkms/20200619_205835_f474a@/log.gz

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https://bugs.launchpad.net/bugs/1884634

Title:
  backport-iwlwifi-dkms 8324-0ubuntu3 ADT test failure with linux-5.8
  5.8.0-1.2

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