tests: tinycrypt: disable for ARC QEMU platforms

Even though ARC QEMU has received advanced multiplication
instructions support recently the ARC QEMU in the latest
Zephyr SDK still misses them, so tinycrypt may execute
too long and reach timeout in case of execution on
slow host.

Disable tinycrypt for ARC QEMU platforms till we update
ARC QEMU in Zephyr SDK.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>