Add DKMS package with patched hpsa driver

[artizirk]

This simplifies patching of the Linux kernel.

[im-0]

@artizirk, are you still interested in merging this? If yes, I propose the following:

• Move this into contrib/dkms instead of kernel/dkms.
• Create its own .gitignore there.
• Add a link to contrib/dkms into the main README.md.

[artizirk]

Yes, im still interested. Thank you for the feedback, I will push requested changes soon.

[artizirk]

Hi @im-0, I have pushed the changes you requested. Check them out when you have time.

[im-0]

Thanks!