samd: Fix to build with latest tinyusb.

ports/samd/Makefile

@@ -63,16 +63,15 @@ SRC_C = \
 	lib/tinyusb/src/common/tusb_fifo.c \
 	lib/tinyusb/src/device/usbd.c \
 	lib/tinyusb/src/device/usbd_control.c \
+	lib/tinyusb/src/portable/microchip/samd/dcd_samd.c \
 	lib/tinyusb/src/tusb.c \
 	lib/utils/printf.c \
 	lib/utils/pyexec.c \
 	lib/utils/stdout_helpers.c \
 
 ifeq ($(MCU_SERIES),SAMD21)
-SRC_C += lib/tinyusb/src/portable/microchip/samd21/dcd_samd21.c
 SRC_S = lib/utils/gchelper_m0.s
 else
-SRC_C += lib/tinyusb/src/portable/microchip/samd51/dcd_samd51.c
 SRC_S = lib/utils/gchelper_m3.s
 endif
 

ports/samd/tusb_port.c

@@ -108,8 +108,8 @@ const uint16_t *tud_descriptor_string_cb(uint8_t index) {
         }
     }
 
-    // first byte is len, second byte is string type
-    desc_str[0] = TUD_DESC_STR_HEADER(len);
+    // first byte is length (including header), second byte is string type
+    desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2 * len + 2);
 
     return desc_str;
 }