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 <Ioannis.Glaropoulos@nordicsemi.no>
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