Add helper service for cmsis-rtos2 support

[GorgonMeducer]

The current Display Adapter is written for the bare-metal environment. However, users can start a dedicated Thread/Task to run the display adapter task (e.g. disp_adapter0_task) function, but better RTOS supports can be added, for example:

• Blocking the display adapter task and yield when the pixel pipeline is
  • busy
  • waiting for resources
  • waiting for async tasks to complete in the backend
  • etc
• Fully support asynchronous mode
• Improve system parallelism

To achieve this, we have to upgrade the display adapter service and add RTOS support for:

• cmsis-rtos
• cmsis-rtos2

Supports for other RTOS, e.g. FreeRTOS, ThreadX, RT-Thread can be added later.

[GorgonMeducer]

RTOS helper services are added for

• CMSIS-RTOS
• User Custom