Turris Mox rWTM ECDSA message signing

configname: CONFIG_TURRIS_MOX_RWTM_KEYCTL

Linux Kernel Configuration
└─>Device Drivers
└─>Firmware Drivers
└─>Turris Mox rWTM ECDSA message signing
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
Say Y here to add support for ECDSA message signing with board private
key (each Turris Mox has an ECDSA private key generated in the secure
coprocessor when manufactured). This functionality is exposed via the
keyctl() syscall.