rtl8195am - remove obsolete configs
rtl8195am - remove obsolete configs

The following configs were no longer necessary for RTX5.
    OS_TASKCNT
    OS_MAINSTKSIZE
    OS_CLOCK

Signed-off-by: Tony Wu <7d96f1423e8ab604e1604a0ea55fe51a076a8533@realtek.com>

kjbracey-arm/mbed,Archcady/mbed-os,Archcady/mbed-os,karsev/mbed-os,CalSol/mbed,ryankurte/mbed-os,c1728p9/mbed-os,mbedmicro/mbed,ryankurte/mbed-os,HeadsUpDisplayInc/mbed,mbedmicro/mbed,CalSol/mbed,c1728p9/mbed-os,karsev/mbed-os,c1728p9/mbed-os,ryankurte/mbed-os,andcor02/mbed-os,mbedmicro/mbed,kjbracey-arm/mbed,mazimkhan/mbed-os,ryankurte/mbed-os,CalSol/mbed,c1728p9/mbed-os,CalSol/mbed,mbedmicro/mbed,HeadsUpDisplayInc/mbed,infinnovation/mbed-os,betzw/mbed-os,mbedmicro/mbed,infinnovation/mbed-os,mazimkhan/mbed-os,karsev/mbed-os,HeadsUpDisplayInc/mbed,ryankurte/mbed-os,Archcady/mbed-os,karsev/mbed-os,andcor02/mbed-os,betzw/mbed-os,ryankurte/mbed-os,andcor02/mbed-os,infinnovation/mbed-os,CalSol/mbed,infinnovation/mbed-os,kjbracey-arm/mbed,HeadsUpDisplayInc/mbed,karsev/mbed-os,HeadsUpDisplayInc/mbed,mazimkhan/mbed-os,andcor02/mbed-os,karsev/mbed-os,c1728p9/mbed-os,mazimkhan/mbed-os,c1728p9/mbed-os,betzw/mbed-os,CalSol/mbed,Archcady/mbed-os,mazimkhan/mbed-os,betzw/mbed-os,kjbracey-arm/mbed,Archcady/mbed-os,betzw/mbed-os,mazimkhan/mbed-os,Archcady/mbed-os,infinnovation/mbed-os,infinnovation/mbed-os,andcor02/mbed-os,HeadsUpDisplayInc/mbed,betzw/mbed-os,andcor02/mbed-os