chg: the inital modification of t55xx commands to use Marshmellows new demod functions.

fix:  merged  readblock & readblockPWD command.
      New syntax:    "lf t55xx rd <block> <password>"   -- OPTIONAL password

fix.  merged  writeblock & writeblockPWD command.
      New syntax:    "lf t55xx wr <block> <data> <password>"   -- OPTIONAL password

armsrc/lfops.c

@@ -982,7 +982,7 @@ void TurnReadLFOn(){
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 	// Give it a bit of time for the resonant antenna to settle.
 	//SpinDelay(30);
-	SpinDelayUs(8*150);
+	SpinDelayUs(9*150);
 }
 
 /*-------------- Cloning routines -----------*/