ARM: Introduce plat-tcc

This patch introduces support for the tcc platform by creating an
arch/arm/plat-tcc and arch/arm/mach-tcc8k directories and adding
basic include files plus Kconfig and Makefile.

Signed-off-by: "Hans J. Koch" <hjk@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>