time: Expose get_monotonic_boottime64 for in-kernel use
time: Expose get_monotonic_boottime64 for in-kernel use

As part of the 2038 conversion process, add a
get_monotonic_boottime64 accessor so we can depracate
get_monotonic_boottime.

Cc: pang.xunlei <8f3df7547938bf466547d5e4573831d5224028fc@linaro.org>
Cc: Arnd Bergmann <31ce0e01d6a887319e98c2278af71350d5f64c4f@linaro.org>
Cc: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>
Cc: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>
Signed-off-by: John Stultz <33837adfb53316eae44aad04041e1240088d76fd@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs