Log: controller: add FSA input register flag functions
... instead of set_bit()/clear_bit(), which improves trace messages like:
Bit 0x0001000 set by some_function:100 Bit 0x0008000 set by some_function:101
to:
FSA input flags 0x00009000 (R_JOIN_OK|R_INVOKE_PE) for controller set by some_function:100