explicitly add dcd source file without vendor/family

hw/bsp/samg55xplained/board.mk

@@ -20,6 +20,7 @@ ASF_DIR = hw/mcu/microchip/samg55
 LD_FILE = hw/bsp/$(BOARD)/samg55j19_flash.ld
 
 SRC_C += \
+	src/portable/microchip/samg/dcd_samg.c \
 	$(ASF_DIR)/samg55/gcc/gcc/startup_samg55.c \
 	$(ASF_DIR)/samg55/gcc/system_samg55.c \
 	$(ASF_DIR)/hpl/core/hpl_init.c \
@@ -40,10 +41,6 @@ INC += \
 	$(TOP)/$(ASF_DIR)/hri \
 	$(TOP)/$(ASF_DIR)/CMSIS/Core/Include
 
-# For TinyUSB port source
-VENDOR = microchip
-CHIP_FAMILY = samg
-
 # For freeRTOS port source
 FREERTOS_PORT = ARM_CM4F