Remove Telechips ARM subarch from MAINTAINERS

The ARM subarchitecture for Telechips SoCs isi being completely removed,
so there's no need for a MAINTAINERS entry.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Harry Sievers <hsievers@csselectronic.com>
Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>