[binutils-gdb] sim: dv-sockser: move build to common dir

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 49cd1634b2a59879329c5a285192ac581e64904c ***

Author: Mike Frysinger <vapier@gentoo.org>
Branch: master
Commit: 49cd1634b2a59879329c5a285192ac581e64904c

sim: dv-sockser: move build to common dir
If dv-sockser is available, lets add it to the common SIM_HW_OBJS
variable so it is always included automatically.  Now ports do not
have to shoe horn it in directly themselves.  It does mean it will
be compiled for targets that don't explicitly use it, but that's
really what we want anyways.