staging: pi433: Redefine F_OSC using units.h macro

Use HZ_PER_MHZ for a more robust definition.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Shahar Avidar <ikobh7@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240227221204.534131-4-ikobh7@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/pi433/rf69.c

@@ -8,11 +8,12 @@
 
 #include <linux/types.h>
 #include <linux/spi/spi.h>
+#include <linux/units.h>
 
 #include "rf69.h"
 #include "rf69_registers.h"
 
-#define F_OSC	  32000000 /* in Hz */
+#define F_OSC (32 * HZ_PER_MHZ)
 
 /*-------------------------------------------------------------------------*/