TESTS-MBEDMICRO-RTOS-MBED-SYSTIMER:  include ticker_free() function in the ticker interface.
TESTS-MBEDMICRO-RTOS-MBED-SYSTIMER:  include ticker_free() function in the ticker interface.

kjbracey-arm/mbed,andcor02/mbed-os,betzw/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed,c1728p9/mbed-os,c1728p9/mbed-os,mbedmicro/mbed,betzw/mbed-os,kjbracey-arm/mbed,c1728p9/mbed-os,andcor02/mbed-os,betzw/mbed-os,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,betzw/mbed-os,betzw/mbed-os,c1728p9/mbed-os,kjbracey-arm/mbed,c1728p9/mbed-os,c1728p9/mbed-os,betzw/mbed-os,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed