[efr32] Radio: correctly set mAckedWithFramePending (#4484)
[efr32] Radio: correctly set mAckedWithFramePending (#4484)

srickardti/openthread,bukepo/openthread,chshu/openthread,chshu/openthread,chshu/openthread,bukepo/openthread,bukepo/openthread,openthread/openthread,srickardti/openthread,jwhui/openthread,bukepo/openthread,lanyuwen/openthread,librasungirl/openthread,jwhui/openthread,openthread/openthread,abtink/openthread,librasungirl/openthread,openthread/openthread,lanyuwen/openthread,librasungirl/openthread,srickardti/openthread,lanyuwen/openthread,jwhui/openthread,chshu/openthread,abtink/openthread,chshu/openthread,abtink/openthread,lanyuwen/openthread,srickardti/openthread,librasungirl/openthread,chshu/openthread,lanyuwen/openthread,abtink/openthread,lanyuwen/openthread,jwhui/openthread,openthread/openthread