Disable intel_gmch_probe() and intel_enable_gtt() - v4.11 fbsd11.2

[saper]

This backport of #73 onto drm-v4.11-fbsd11.2 fixes https://github.com/FreeBSDDesktop/kms-drm/issues/225

• drm/i915: Remove trailing spaces in intel_freebsd.c

While here:

• Add a space between a variable and the + operator.

• Rename one __notyet to __notyet__.

• drm/i915: Disable intel_gmch_probe() and intel_enable_gtt()

They are now no-ops, like they are in drm2 in FreeBSD base.

They were used by Intel GPUs up to and including gen 5. This patch makes the driver work on those old Intel GPUs. At least it was successfully tested on an Intel 965GM coupled with an Intel Core 2 Duo from 2007.

[zeising]

Please separate out whitespace fixes from functional changes in different commits. Disregard this, I see that this is pulled from a different branch.

[zeising]

Have you used git cherry-pick? Any chance you can use -x so it's easy to see where this was picked from? (git cherry-pick -x adds a reference to the original commit in this commit message).

[saper]

@zeising No, I think I have merged them. No problem, the branch is now updated with two commits cherry picked with -x

[zeising]

Thank you!