zdtm/fpu02: Don't run the test on !x86 platforms

Fixes: commit 925451c12b2e ("zdtm/x86: Add a mxcsr preserving fpu test")
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm/static/fpu02.desc

+{'arch': 'x86_64'}