usb: USB download gadget and functions config options coherent naming

This introduces a coherent scheme for naming USB download gadget and functions
config options. The download USB gadget config option is moved to
CONFIG_USB_GADGET_DOWNLOAD for better consistency with other gadgets and each
function's config option is moved to a CONFIG_USB_FUNCTION_ prefix.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>

Test HW: Odroid_XU3 (Exynos5422), trats (Exynos4210)

include/configs/tbs2910.h

@@ -133,10 +133,10 @@
 #define CONFIG_CI_UDC
 #define CONFIG_USBD_HS
 #define CONFIG_USB_GADGET
-#define CONFIG_USB_GADGET_MASS_STORAGE
+#define CONFIG_USB_FUNCTION_MASS_STORAGE
 #define CONFIG_USB_GADGET_DUALSPEED
 #define CONFIG_USB_GADGET_VBUS_DRAW	0
-#define CONFIG_USBDOWNLOAD_GADGET
+#define CONFIG_USB_GADGET_DOWNLOAD
 #define CONFIG_G_DNL_VENDOR_NUM		0x0525
 #define CONFIG_G_DNL_PRODUCT_NUM	0xa4a5
 #define CONFIG_G_DNL_MANUFACTURER	"TBS"

include/configs/tegra-common-usb-gadget.h

@@ -18,12 +18,12 @@
 #define CONFIG_G_DNL_VENDOR_NUM 0x0955
 #define CONFIG_G_DNL_PRODUCT_NUM 0x701A
 #define CONFIG_G_DNL_MANUFACTURER "NVIDIA"
-#define CONFIG_USBDOWNLOAD_GADGET
+#define CONFIG_USB_GADGET_DOWNLOAD
 /* USB mass storage protocol */
-#define CONFIG_USB_GADGET_MASS_STORAGE
+#define CONFIG_USB_FUNCTION_MASS_STORAGE
 #define CONFIG_CMD_USB_MASS_STORAGE
 /* DFU protocol */
-#define CONFIG_DFU_FUNCTION
+#define CONFIG_USB_FUNCTION_DFU
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE (1 * 1024 * 1024)
 #define CONFIG_CMD_DFU
 #ifdef CONFIG_MMC

include/configs/warp.h

@@ -80,8 +80,8 @@
 
 #define CONFIG_USB_GADGET
 #define CONFIG_CMD_USB_MASS_STORAGE
-#define CONFIG_USB_GADGET_MASS_STORAGE
-#define CONFIG_USBDOWNLOAD_GADGET
+#define CONFIG_USB_FUNCTION_MASS_STORAGE
+#define CONFIG_USB_GADGET_DOWNLOAD
 #define CONFIG_USB_GADGET_VBUS_DRAW	2
 
 #define CONFIG_G_DNL_VENDOR_NUM		0x0525
@@ -89,7 +89,7 @@
 #define CONFIG_G_DNL_MANUFACTURER	"FSL"
 
 #define CONFIG_CMD_DFU
-#define CONFIG_DFU_FUNCTION
+#define CONFIG_USB_FUNCTION_DFU
 #define CONFIG_DFU_MMC
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE SZ_16M
 #define DFU_DEFAULT_POLL_TIMEOUT 300

include/configs/zynq-common.h

@@ -110,10 +110,10 @@
 # define CONFIG_CI_UDC           /* ChipIdea CI13xxx UDC */
 # define CONFIG_USB_GADGET
 # define CONFIG_USB_GADGET_DUALSPEED
-# define CONFIG_USBDOWNLOAD_GADGET
+# define CONFIG_USB_GADGET_DOWNLOAD
 # define CONFIG_SYS_DFU_DATA_BUF_SIZE	0x600000
 # define DFU_DEFAULT_POLL_TIMEOUT	300
-# define CONFIG_DFU_FUNCTION
+# define CONFIG_USB_FUNCTION_DFU
 # define CONFIG_DFU_RAM
 # define CONFIG_USB_GADGET_VBUS_DRAW	2
 # define CONFIG_G_DNL_VENDOR_NUM	0x03FD
@@ -123,7 +123,7 @@
 # define CONFIG_USB_CABLE_CHECK
 # define CONFIG_CMD_DFU
 # define CONFIG_CMD_THOR_DOWNLOAD
-# define CONFIG_THOR_FUNCTION
+# define CONFIG_USB_FUNCTION_THOR
 # define DFU_ALT_INFO_RAM \
 	"dfu_ram_info=" \
 	"set dfu_alt_info " \