Completing CMake variable generation for USB parameters (AVR Support)

- Had to add the iSerialNumber parameter to the AVR USB descriptor
- Removed a faulty pack command for avr-gcc that is not required

USB/pjrc/arm/usb_desc.h

@@ -23,10 +23,6 @@
 #define DEVICE_CLASS		0xEF
 #define DEVICE_SUBCLASS	0x02
 #define DEVICE_PROTOCOL	0x01
-#define MANUFACTURER_NAME	{'T','e','e','n','s','y','d','u','i','n','o'}
-#define MANUFACTURER_NAME_LEN	11
-#define PRODUCT_NAME		{'S','e','r','i','a','l','/','K','e','y','b','o','a','r','d','/','M','o','u','s','e','/','J','o','y','s','t','i','c','k'}
-#define PRODUCT_NAME_LEN	30
 #define EP0_SIZE		64
 #define NUM_ENDPOINTS		15
 #define NUM_INTERFACE		5