arch: arm: clear BFSR sticky bits in ARMv8-M Mainline MCUs
arch: arm: clear BFSR sticky bits in ARMv8-M Mainline MCUs

Contrary to ARMv7-M, in ARMv8-M MCUs with the Main Extension,
BusFault Status Register bits are sticky and must be cleared.

Signed-off-by: Ioannis Glaropoulos <5921cc8bab7e1d4329f52fd8f6268f9692e3de80@nordicsemi.no>

Vudentz/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,kraj/zephyr,galak/zephyr,nashif/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,zephyriot/zephyr,Vudentz/zephyr,kraj/zephyr,nashif/zephyr,zephyriot/zephyr,ldts/zephyr,kraj/zephyr,finikorg/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,Vudentz/zephyr,punitvara/zephyr,nashif/zephyr,punitvara/zephyr,zephyriot/zephyr,ldts/zephyr,kraj/zephyr,kraj/zephyr,explora26/zephyr,explora26/zephyr,finikorg/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,mbolivar/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,mbolivar/zephyr,punitvara/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,ldts/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,explora26/zephyr,explora26/zephyr