staging: pi433: cleanup comments in rf69.h

Fixes checkpatch warning:

  WARNING: line over 80 characters
Signed-off-by: Valentin Vidic <Valentin.Vidic@CARNet.hr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/pi433/rf69.h

@@ -21,10 +21,11 @@
 #include "rf69_enum.h"
 #include "rf69_registers.h"
 
-#define F_OSC		32000000  /* in Hz */
-#define FREQUENCY	433920000 /* in Hz, modifying this value impacts CE certification */
-#define FIFO_SIZE	66		/* in byte */
-#define FIFO_THRESHOLD	15		/* in byte */
+/* NOTE: Modifying FREQUENCY value impacts CE certification */
+#define F_OSC		32000000	/* Hz */
+#define FREQUENCY	433920000	/* Hz */
+#define FIFO_SIZE	66		/* bytes */
+#define FIFO_THRESHOLD	15		/* bytes */
 
 int rf69_set_mode(struct spi_device *spi, enum mode mode);
 int rf69_set_data_mode(struct spi_device *spi, u8 data_mode);