HAL_SMACCM: removed SMACCM HAL port

this port is no longer maintained or used. Pat asked me to remove it
Copter: removed SMACCM support
AP_Common: removed SMACCM support
AP_Compass: removed SMACCM support
AP_HAL: removed SMACCM support
AP_InertialSensor: removed SMACCM support
AP_Notify: removed SMACCM support
AP_Progmem: removed SMACCM support
Filter: added in Leonards LowPassFilter2p filter

this is a backport from PX4