s390/time: Add read_persistent_wall_and_boot_offset()

read_persistent_wall_and_boot_offset() will replace read_boot_clock64()
because on some architectures it is more convenient to read both sources
as one may depend on the other. For s390, implementation is the same
as read_boot_clock64() but also calling and returning value of
read_persistent_clock64()

Signed-off-by: Pavel Tatashin <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Martin Schwidefsky <[email protected]>
Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
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Link: https://lkml.kernel.org/r/[email protected]

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