Merge "Clarify clockid_t generation." into main am: a4ccf51a2a

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3531730

Change-Id: I054c65508e4b44fe0ceae3748a53cd265a84ebaf
Signed-off-by: Automerger Merge Worker <[email protected]>