tests: ztest: added test case for multiple mock expects
tests: ztest: added test case for multiple mock expects

The test verifies that the mock framework can handle functions
under test which call more than one mock function, and
correctly processes each call.

Signed-off-by: Morten Priess <eeac701aa7fa64292a00ac226283761853032460@oticon.com>

zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,kraj/zephyr,galak/zephyr,ldts/zephyr,ldts/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,nashif/zephyr,ldts/zephyr,galak/zephyr,nashif/zephyr,kraj/zephyr,kraj/zephyr,ldts/zephyr,Vudentz/zephyr,explora26/zephyr,punitvara/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,explora26/zephyr,Vudentz/zephyr,kraj/zephyr,nashif/zephyr,ldts/zephyr,finikorg/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,finikorg/zephyr,explora26/zephyr,explora26/zephyr,Vudentz/zephyr,punitvara/zephyr