arm: Remove Telechips subarchitecture

Unfortunately, nobody is interested in having support for Telechips' SoCs in mainline. With neither feedback nor support from anywhere, I am not willing to maintain this any longer.

Russell requires subarchs to be up-to-date and maintainers to do their work to prevent their subarchs from bit-rotting. That is completely the right thing to do.

For me, the only possible course of action is to completely remove the whole Telechips subarchitecture. I'll reply to this mail with a series of four patches that does this.

Thanks,
Hans