Fix issues with LowPowerTickerWrapper

[ccli8]

Description

On all Nuvoton targets, LPTICKER_DELAY_TICKS is enabled which relies on LowPowerTickerWrapper. This PR tries to fix some corner case errors with LowPowerTickerWrapper:

1. _ticker_match_interval_passed doesn't see _last_set_interrupt == _cur_match_time as matched. Add extra check for it.
2. Fix "too close" check with _min_count_until_match.

Pull request type

[X] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change

[c1728p9]

Thanks for the fix @ccli8. @cmonr this is something you'll probably want for 5.10.1

[cmonr]

Thanks for the heads up. Initially missed it since the Nuvoton PRs have generally had something in the totle indicating as such.

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3103
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8029/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2710
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8029/

[mbed-ci]

Test : SUCCESS

Build number : 2892
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8029/2892