require regdb signature

configname: CONFIG_CFG80211_REQUIRE_SIGNED_REGDB

Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>require regdb signature
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Require that in addition to the "regulatory.db" file a
"regulatory.db.p7s" can be loaded with a valid PKCS#7
signature for the regulatory.db file made by one of the
keys in the certs/ directory.

selects
CONFIG_SYSTEM_DATA_VERIFICATION