New generic kernel configs per arch
Removing old generic kernel config
ppl and setserial no longer part of core
Split stage2-build into stage2-toolchain and stage2-build

- Changed how default answers are picked by letting lin handle it instead of
  answering 'n' to everything (this does not apply to stage2-toolchain which
  still needs 'n')
- Added Linux-PAM to toolchain since it needs to exist before all other
  modules get installed or they end up without pam support