libfiemap: Ignore userdata requirements in fiemap_writer_test when running a DSU.

The test is guaranteed to fail because userdata is itself a fiemap-backed device.

Bug: 154447105
Test: fiemap_writer_test on DSU
Change-Id: Ied35da0eb7aba3daca7ed430f006bf1e90e21dca
Merged-In: Ied35da0eb7aba3daca7ed430f006bf1e90e21dca
2 files changed