[test] Move to earlier deployment target as workaround
We are already using 5.4 target as a workaround for missing
LC_DYLD_CHAINED_FIXUPS support in reflection tools, but we need to
further workaround a linker bug in older versions of ld-prime that
caused appletv simulator platform to be misidentified and use chained
fixups earlier than it should, so move back to 5.2.
(cherry picked from commit b5f290dc4959775825d0be0f23d03845e4eb2ed8)
(cherry picked from commit 6f657c715de680859ceebfd8c93c95d6ea89546d)
