* tock: use native time getter, remove globals
Tock has direct support for querying time. The prior `millis()`
method here replicated the same functionality, but missed some
corner case concerns around overflow/wrapping. Instead, just use
the native Tock time getter method. This also removes unneeded
global variables and methods.
* NonArduino/Tock: Update to latest libtock-c
Update to the latest libtock-c commit. libtock-c now includes a
libtockHal.h, so we can use that instead of the version here.
Signed-off-by: Alistair Francis <alistair@alistair23.me>
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Signed-off-by: Alistair Francis <alistair@alistair23.me>
Co-authored-by: Pat Pannuto <pat.pannuto@gmail.com>
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