Change get_timestamp() return type to int64_t to support ARMCC#12

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LDong-Arm wants to merge 1 commit intoARMmbed:masterfrom

LDong-Arm:arm_time_t

Commits on Jul 23, 2020

Change get_timestamp() to return int64_t instead of time_t which is uint32_t on ARMCC
LDong-Arm
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