[binutils-gdb] sim: cr16: add _start symbol to tests [BZ #12385]

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 4daf7a7c3a8404d8be973702ffe00541f71606a4 ***

Author: Mike Frysinger <vapier@gentoo.org>
Branch: master
Commit: 4daf7a7c3a8404d8be973702ffe00541f71606a4

sim: cr16: add _start symbol to tests [BZ #12385]
The current cr16 testsuite sets up _START, but the linker looks for the
_start symbol.  Add the latter as an alias to the former.