CMSIS RTOS V1: Introduce CMSIS RTOS V1 API header file

CMSIS RTOS API provides a generic RTOS interface for embedded
processors (actually for Cortex-M processors but are generic
enough to be used elsewhere). This header file is for V1 version.

Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>