rc/dcf_signal: Style fixes and alignments
rc/dcf_signal: Keep track of whether pulse is high or low
rc/dcf_signal: Reword 'Look' with 'Check'
rc/dcf_signal: Add min pulse time noise check
rc/dcf_signal: Fix vertical alignment
rc/dcf_signal: Add better declaration comments
rc/dcf_signal: Don't forget to reset internal counters
rc/dcf_signal: Fix line length
rc/dcf_signal: Fix MAX_S_TIME
rc/dcf_signal: Remove unused generic
rc/dcf_signal: Derive clk_period from clk_freq