Testing / mtd_nvs MTD non-volatile storage Test

This is a test for MTD non-volatile storage. MTD non-volatile storage was originally implemented in Zephyr by Laczen. We made several modification to the original design. The main purpose of those modification was:

1. support C-string key in nvs API(Original design only support uint16_t as key)
2. Meanwhile achieve better performance by limiting flash read times(Theoratically better than Zephyr subsys/settings, which is based on original NVS).

• CONFIG_TESTING_FAILSAFE_MTD_CONFIG – Enable the test.
• CONFIG_TESTING_FAILSAFE_MTD_CONFIG_VERBOSE – Verbose output.

EXAMPLE mtdconfig_fs_test -m /dev/config – Test MTD NVS on /dev/config mtdconfig_fs_test -h – Get help message