testimage.bbclass: fix qemu_use_kvm handling
QEMU_USE_KVM can either be a boolean or a whitespace separated list
of kvm supported machines.
For the 'intel-corei7-64' machine, defined in meta-intel, kvm could not be
used as the 'x86' substring is not part of its machine name.
By changing the order of this 'or' statement and setting
the 'QEMU_USE_KVM' variable to 'intel-corei7-64', it is possible to run the
'testimage' task with kvm support successfully.
(From OE-Core rev:
a22789253aa653dc50fb159b40910248c2f98dd4)
Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
