Enable loading of platform and blacklisted keys for POWER

configname: CONFIG_LOAD_PPC_KEYS

Linux Kernel Configuration
└─>Security options
└─>Enable loading of platform and blacklisted keys for POWER
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Enable loading of keys to the .platform keyring and blacklisted
hashes to the .blacklist keyring for powerpc based platforms.