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igt@gem_pwrite@big-.* are agonizingly slow on some platforms

These tests are responsible for a significant amount of the overall reported time of a CI FULL run:

  • shard-skl: 0.1% (~15 seconds)
  • shard-kbl: 3.5% (~4.5 minutes)
  • shard-apl: 10% (~18 minutes)
  • shard-glk: 6.3% (~14 minutes)
  • shard-icl: 1.7% (~3.5 minutes)
  • shard-tgl: 1.6% (~3 minutes)

As per @ickle's suggestion, they likely need to be replaced by a kernel self test:

They are testing the obj->mm.get_page cache which is used for all page lookups in the driver.

It's harder to predictably exercise from userspace through other interfaces.

So replace with a unittest for the cache :p
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