tusb: rename `foosn` to `valentyusb`

Use the name `valentyusb` as the vendor for the `valentyusb`
project, rather than the manufacturer name of the Fomu device.

This is because the `valentyusb` core can be used across multiple
vendors, much like how other cores can be used across chip vendors.

Signed-off-by: Sean Cross <sean@xobs.io>

src/tusb_option.h

@@ -70,7 +70,7 @@
 
 #define OPT_MCU_CXD56         400 ///< SONY CXD56
 
-#define OPT_MCU_FOMU_EPTRI    600 ///< Fomu eptri config
+#define OPT_MCU_VALENTYUSB_EPTRI 600 ///< Fomu eptri config
 
 /** @} */