drm: Add headers and infrastructure required by Linux 4.13+ code

drm: Add headers, stubs and constants required by Linux 4.10 code

drm: Remove most system headers from linux/list.h

They do not serve any useful purpose there.

Suggested-by: zrj

drm: Fix Linux/DragonFly PAGE_MASK confusion

* Both Linux and the DragonFly kernel use a PAGE_MASK constant,
which is unfortunately defined differently in each one

* Define a LINUX_PAGE_MASK macr

drm: Fix Linux/DragonFly PAGE_MASK confusion

* Both Linux and the DragonFly kernel use a PAGE_MASK constant,
which is unfortunately defined differently in each one

* Define a LINUX_PAGE_MASK macro and use it when applicable in the
drm code to fix this confusion

* One or two drm/radeon bugs were possibly caught during the process

* This commit based on a patch by tuxillo

Spotted-by: tuxillo
Fixes: https://bugs.dragonflybsd.org/issues/3171

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drm/linux: use pgprot_t

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one withou

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one without further thought.

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drm/linux: Add asm/memory_model.h

drm: Add asm/page.h