meta-ide-support: Mark recipe as MACHINE-specific

meta-ide-support:do_write_test_data dumps the bitbake data dictionary to
a file using export2json(). As this obviously includes the value of
MACHINE, and other MACHINE-specific variables, the recipe needs to be
marked as MACHINE-specific.

RP: Note that this patch does change the name of the environment script
since it is no longer package arch specific but machine arch specific.

[RP: Fix selftest to reference new environment file]
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>