Time functions supported in optee

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optee Support the following 3 Functions to get time ( It's also GP Stipulated )：

• （1）TEE_GetREETime(TEE_Time *time) // obtain REE System Time Stamp
• （2）TEE_GetSystemTime(TEE_Time *time) // obtain TEE System Time Stamp
• （3）TEE_GetTAPersistentTime(TEE_Time *time) // Get current TA The timestamp
  notes : There is also TEE_SetTAPersistentTime(const TEE_Time *time)

this 3 individual API Functions are called through the system , Call to the underlying syscall_get_time, In this function, different branches will be taken according to the parameters passed .