lib/igt_aux: add functions to manipulate i915.ko parameters

Some i915.ko features have very nice IGT tests, which are never
executed because the features are disabled by default. This leads to
unnoticed regressions both in the Kernel and in the IGT tests.  We
have seen this multiple times, for example, on FBC and PSR.

We want to be able to run IGT and actually test these
disabled-by-default features in order to make sure we at least don't
break them even more. Sometimes they may be disabled for some specific
reason, and we don't want to increase the set of reasons without
noticing.

To help solving this problem, this commit adds some helper functions
that should make it easier to change certain i915.ko parameters and
then restore their original values at the end of the test. With this,
I'm hoping QA will be able to detect any regressions and automatically
bisect them - or, with PRTS, reject the patches before they are even
merged.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

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