staging: pi433: Remove a duplicated F_OSC define

F_OSC is already defined & only used by rf69.c source file.
Signed-off-by: Shahar Avidar <ikobh7@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240227221204.534131-3-ikobh7@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/pi433/rf69.h

@@ -12,7 +12,6 @@
 #include "rf69_registers.h"
 
 /* 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 */