nvmkv_driver.c: Followed nvm_kv_open() API changes in NVMKV 1.0.0
nvmkv_driver.c: warp_kv_get_current() now honors NVM_KV_MAX_VALUE_SIZE
Nvmkv.rb: Followed nvm_kv_open() API changes in NVMKV 1.0.0