Remove duplicate bufferreadwriterect compatibility test (#541)

The only diff between the main and compatibility versions of the test
is that the region overlap check was fixed in the main one (see
487c4696ff070e1a3cb23dbb08096d3f4ef11fe3 in Gitlab).

Contributes to #494

Signed-off-by: Kevin Petit <kevin.petit@arm.com>
3 files changed