[d-kernel] [PATCH sisyphus 6.12/6.13/6.14/6.15 0/4] config: Cleanup unused and obsolete configuration options

[Vasiliy Kovalev]

Remove certain configuration options that are unused due to dependencies
on inactive subsystems, preventing confusion during evaluation.

Additionally, remove options related to the ReiserFS filesystem, as its
code has been removed from the kernel.

[PATCH 1/4] config: Remove ARCNET-related modules (CONFIG_ARCNET is not set)
[PATCH 2/4] config: Remove ATM-related modules (CONFIG_ATM is not set)
[PATCH 3/4] config: Remove ISDN-related modules (CONFIG_ISDN is not set)
[PATCH 4/4] config: Remove obsolete REISERFS configuration options