tests: crypto: Fully initialize variables using named initializers
tests: crypto: Fully initialize variables using named initializers

This should get rid of Valgrind warnings in #7478.

Signed-off-by: Leandro Pereira <51c7437a02b34df685e6b4ecb2e9bca23efe2e1a@intel.com>

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