add sam3u port forked from samhs

Signed-off-by: Rafael Silva <[email protected]>

Author: perigoso

src/common/tusb_mcu.h

@@ -110,6 +110,11 @@
   #define TUP_RHPORT_HIGHSPEED    0x01
   #define TUP_DCD_ENDPOINT_EXCLUSIVE_NUMBER
 
+#elif TU_CHECK_MCU(OPT_MCU_SAM3U)
+  #define TUP_DCD_ENDPOINT_MAX    7
+  #define TUP_RHPORT_HIGHSPEED    0x01
+  #define TUP_DCD_ENDPOINT_EXCLUSIVE_NUMBER
+
 #elif TU_CHECK_MCU(OPT_MCU_PIC32MZ)
   #define TUP_DCD_ENDPOINT_MAX    8
   #define TUP_DCD_ENDPOINT_EXCLUSIVE_NUMBER