Pixel 5a

https://review.calyxos.org/q/topic:barbet

• Fork device repos
• APV
• Boots with prebuilt kernel
• Self-built kernel
• Signing
• Locked bootloader
• OTA updates
• Update various repos (website, release, etc)
• Create fdroid repos
• Generate signing keys (should check avb params, mkkeys.sh)
• Test device-flasher