Update watchdog timing test

[fkjagodzinski]

Description

Skip test cases with unsupported timeout values in tests-mbed_hal-watchdog_timing.

The arbitrary timeout values used in this test may be too long for some of the partners' boards. Some of them only support timeout values up to 150 ms.

Pull request type

[X] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

CC @scartmell-arm @jamesbeyond

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2180
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7021/

Triggering tests

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

[mbed-ci]

Test : SUCCESS

Build number : 1968
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7021/1968

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1805
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7021/