Adding a secondary HID interface that emulates a keyboard.

With it, an app can send a password directly to the host, like it is typed by user.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/usb/hid/ctap_hid.h

@@ -143,6 +143,8 @@ typedef struct {
 #define CTAP1_ERR_INVALID_CHANNEL     0x0b    // CID not valid
 #define CTAP1_ERR_OTHER               0x7f    // Other unspecified error
 
+extern void add_keyboard_buffer(const uint8_t *, size_t);
+
 #ifdef __cplusplus
 }
 #endif