tests/kernel/test_multilib: Test for proper multilib selection.

This test is prompted by incorrect multilib selection for Cortex-M4
(armv7e-m subarchitecture) in Zephyr SDK 0.8.1 toolchain. The idea
is do an operation which guaranteedly results in a call to a support
routine in libgcc, which is part of multilib set. Long long division
is used as such, with a fault produced (see README) when built for
BOARD=frdm_k64f.

This test now passed with SDK 0.8.2 for frdm_k64f, but is added in
the hope of preventing/easing diagnosis of future regressions.

Change-Id: I07f01b0e70921703fc0d261fc6c48a2b13b29873
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>