rp2040: shuffle hw_endpoint members

Ordering by element size prevents alignment holes, and as a consequence the
host mode version of the struct is the same size as device, as pad bytes at
the end are used instead.

src/portable/raspberrypi/rp2040/rp2040_usb.h

@@ -64,17 +64,19 @@ typedef struct hw_endpoint
     // Buffer pointer in usb dpram
     uint8_t *hw_data_buf;
 
-    // Current transfer information
-    bool active;
-    uint16_t remaining_len;
-    uint16_t xferred_len;
-
     // User buffer in main memory
     uint8_t *user_buf;
 
+    // Current transfer information
+    uint16_t remaining_len;
+    uint16_t xferred_len;
+
     // Data needed from EP descriptor
     uint16_t wMaxPacketSize;
 
+    // Endpoint is in use
+    bool active;
+
     // Interrupt, bulk, etc
     uint8_t transfer_type;