Changed GD32F1 bootloader to default to 96Mhz as changes to the GD32F1 core now allow swicthing of clock speed which is independant of the bootloader speed, and 96Mhz is the fastest speed that the GD32 is documented to operate at and still supports USB

Author: rogerclarkmelbourne

GD32F1/binaries/generic_boot20_pc13.bin

@@ -124,8 +124,8 @@ volatile int waitLoop;
 #define PLLMF_SHIFT 18
 #define USBPS_SHIFT 22
 
-// set the speed option to 72Mhz as this is safe (as is 96Mhz)
-#define SPEED_120MHZ 1
+// Set the speed to 96Mhz as this is within spec and supports USB.
+#define SPEED_96MHZ 1
 
 #if defined(SPEED_72MHZ)
 	#define PLLMF 6