Add a configuration to enable or disable support for repair mode

Enables or disables the platform's repair mode. The feature creates
a secure environment to protect the user's privacy when the device
is being repaired. Off by default, since OEMs may have had a similar
feature on their devices.

Bug: 277560577
Test: Build
Change-Id: I6217b00b488851c63f3249c74ca2b64ace29806f