cgtqmx6eval: Add fastboot support

Tested basic fastboot commands, such as:

On the U-boot prompt:

=> fastboot 0

On the host PC:

$ fastboot getvar bootloader-version -i 0x0525
bootloader-version: U-Boot 2015.10-rc2-09654-g8f41d27
finished. total time: 0.000s

$ fastboot reboot -i 0x0525 --> board reboots fine.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>

include/configs/cgtqmx6eval.h

@@ -89,6 +89,12 @@
 #define CONFIG_G_DNL_PRODUCT_NUM	0xa4a5
 #define CONFIG_G_DNL_MANUFACTURER	"Congatec"
 
+#define CONFIG_USB_FUNCTION_FASTBOOT
+#define CONFIG_CMD_FASTBOOT
+#define CONFIG_ANDROID_BOOT_IMAGE
+#define CONFIG_FASTBOOT_BUF_ADDR   CONFIG_SYS_LOAD_ADDR
+#define CONFIG_FASTBOOT_BUF_SIZE   0x07000000
+
 /* Framebuffer */
 #define CONFIG_VIDEO
 #define CONFIG_VIDEO_IPUV3