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The macro calculates an absolute address rather than an offset so
rename it to avoid confusion.

Change-Id: I351f73dfd809fd28c0c30d38928caf5c5cd1af04

Given the service name and timestamp id, this assembler macro
calculates the offset into a memory region where the per-cpu timestamp
value is located.

Change-Id: I47f6dfa2a17be182675e2ca0489d6eed42433209

More headers will be needed soon so better to move these to their own
directory to avoid cluttering include/lib.

Change-Id: I6a72dc5b602d6f51954cf60aadd1beb52a268670