ASSERT opnd_disassemble: invalid opnd type on rel-addr opnd on aarch32

Running a drbbdup test that creates a rel-addr opnd on aarch32:

SYSLOG_ERROR: Application suite/tests/bin/simple_app (2316) DynamoRIO usage error : opnd_disassemble: invalid opnd type

It looks like internal_opnd_disassemble() incorrectly has REL_ADDR_kind handling under ifdef X64 instead of X64 || ARM.