tests/prime_self_import: Swap gtt mapping for cpu

The test uses gtt mapping to check two BOs have the same content, since
it seems there is no contention on the BOs use cpu mapping to make it
compatible with platforms that do not have a mappable aperture.

v2:
	- Need to have an explicit set_domain. (Chris)

Signed-off-by: Antonio Argenziano <antonio.argenziano@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
13 jobs for master in 8 minutes and 4 seconds (queued for 33 seconds)
Status Job ID Name Coverage
  Build
passed #134693
build:tests-debian-autotools

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build:tests-debian-meson

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build:tests-debian-meson-arm64

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passed #134691
build:tests-debian-meson-armhf

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passed #134687
build:tests-fedora

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passed #134688
build:tests-fedora-no-libunwind

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passed #134689
build:tests-fedora-oldest-meson

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  Test
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test:ninja-test

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passed #134695
test:ninja-test-arm64

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test:ninja-test-armhf

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test:test-list-diff

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  Deploy
passed #134698
pages

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passed pages:deploy

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