panfrost: Fix memory leaks on unit test failures.

Change ASSERT_EQ to EXPECT_EQ to avoid aborting before freeing memory.

Fix defects reported by Coverity Scan.

Resource leak (RESOURCE_LEAK)
leaked_storage: Variable tiled going out of scope leaks the storage it points to.
leaked_storage: Variable linear going out of scope leaks the storage it points to.
leaked_storage: Variable ref going out of scope leaks the storage it points to.

Fixes: bb6c14a6 ("panfrost: Unit test u-interleaved tiling routines")
Suggested-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Part-of: <!16127>
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