tests/nvs: Enable test suite with 0x00 erase value
tests/nvs: Enable test suite with 0x00 erase value

The NVS tests have been disabled here with commit
 tests: nvs: Disable running the 0x00 test suite
 (22be0d8fd5902da11c9bf55a44012abc7c2cf1c1)
due to problems with flash_simulator.

With introduction of below fixes:
 drivers/flash/flash_simulator: Fix flash_sim_write
 (bec0c7f279d818cd623e597438059863c4d43353)
 drivers/flash/fash_simulator: Fix initialization for non-posix
 (849a5432dfb942339e2fc3660022f450d11397cb)

the tests can be enabled back.

Signed-off-by: Dominik Ermel <1a1d45a9cc0c98a37f8d0a0d2dbe3cacc0b2344f@nordicsemi.no>

zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr